Virtuoso calculator functions The result is that the two functions currently behave the same as each other - but we do plan to do something about that. Fine Let's look at the OCEAN Reference Manual but nothing about spectrumMeas() Fortunately, I found on the Online Support it is slightly documented in VIVA manual, from which I (partly) reconstruct the following function prototype : Hence, the solution at a particular node will, in general, contain real and imaginary components. In some cases, delay function is reporting delayB instead of delayA. October 2003 9 Product Version 5. JustinTaylor86 over 12 years ago. Both doing it via a calculator function or the OCEAN script would be a problem because when multiple simulations are run, background virtuoso sessions (a. For more information about SKILL calculator Virtuoso Visualization and Analysis supports FFT and DFT operations on time-domain data using different windowing functions, allowing users to compute signal-to-noise ratio (SNR), total Calculates the noise at the output of the linear and time-invariant circuit, which is linear around the DC operating point. Manp over 8 years ago. Skip to main content. Locked Locked Replies 1 Subscribers 117 Views 19069 Members are (tphl0 tplh1 tplh2 ) . Website: https://www. Products Solutions Support Company Products Community Custom IC Design Adexl Calculator - finding delay between 2 signals. 8. I wonder, if there is something like firstVal() to return the first y-value. The simplest and most powerful feature of the Calculator is the wide selection of built-in functions available for operating on your waveforms. il" and "bbb. Regards, Alfonso . This video shows the use of ADE-XL environment for simulating the circuits using Cadence Virtuoso. Locked Locked Replies 5 I work on the characterization of an amplifier circuit in Cadence Virtuoso and I do not know how to perform some function in the calculator. 612 I have these two plots, which contain the same number of points. a ICRPs) are launched which are in "nograph" mode and so any plotting would not get seen. However, since quitting virtuoso and re-starting will remove the registered functions anyway (unless you're calling calRegisterSpecialFunction in the . I got a reasonable value, but I am wondering, what if I use period_jitter function in the calculator. I run a power sweep in a single tone HB simulation for an amplifier, say with a input power sweep range from -30dBm to 10dBm. I can plot a different function for each one, but what I would ideally like is to have one plot showing function 1 up to sim Re: calculator in canence??? first click on wave button in calculator then select wave in the waveform. VF("/out") - the vf button on the calculator can generate this from some node in your circuit - and then use the calculator xval function. Enter the function f(x), copy/paste it, or upload a photo; Click on "Calculate" How to Calculate Function Equations? To calculate a function equation, you typically need to follow the below steps: Community Custom IC Design Virtuoso ADEXL VIVA Calculator Sum function? Stats. Once in the Virtuoso Schematic Editing window, select the "Instance" icon or type 'i' to place symbols on the schematic. To plot this, click the icon that performs this task. Assuming you're using IC615 ISR12 or later, you can do this in the calculator using: imag(ypm('sp 1 1))/(2*pi*xval(ypm('sp 1 1))) I got the ypm part by using the Direct Plot Main Form, finding the sp results from sp analysis, and then using the "add to outputs" for the YP section of the direct plot form when I hit Y11. Mr. Be aware that fix(3. Locked Locked Hi Anthony, The abBestFitCoeffs function isn't really intended to be used in the calculator. Instead, use the spectrumMeas function . If you have more than one sweep and it’s the wrong variable as the innermost the you could use the swapSweep function and then use the deriv on the result of that. I want to measure the voltage of vin whenever vout crosses a certain threshold, e. Can't even save & load an expression that you got to finally work (so have to grab and paste to an external text file for next time). 16 $ Shawn. 2. Be Informative. For a single event, I can measure the crossover time with This tutorial demonstrates how to use Calculator in ADEL. How can In cadence, there are functions like inl and dnl available in calculator, can anyone guide me to find inl and dnl. You don’t need to repeat other steps though. Waveform Calculator User Guide Overview About the Calculator The calculator has several kinds of buttons. So, I used the abs_jitter function to find the RMS jitter. Applying calculator function to multiple signals at once. The good thing about Cadence is, it's created generations of open source fans. I have a time domain simulation from 0s to 32us (x-axis) and 0V to 3. In you case, if you clip the waveform using the clip() function between the two points that you want to use to define your line, it seems that this function, when applied to the clipped waveform, will I don't know why you've complicated this so much - especially when you've shown the ADS expression which would be almost the same in structure as it would be in the ADE calculator. Or at least something close to that. I am using virtuoso 6. Use correct terminology. 1. now the problem here is to express the threshold value as a variable of the Calculator -> Using 'value' in equation. You can no longer post new replies to this discussion. 55) What's the reason for the last term: dB20(twoPi*f0_pss), i. The points are plotted rather than as a continuous line, to help see the spread at various instants during the eye period. “ Cadence Spectre Calculator ”, such Tool does not exist. My queries-1. Power would be V*I*phase_difference. [/b] 这里写自定义目录标题Virtuoso中使用calculator计算波形计算方法前提步骤注意 Virtuoso中使用calculator计算波形计算方法 本文原创，转载请注明出处 Virtuoso中使用calculator计算波形计算方法 前提 绘制好电路图，并且检查电路图没有错误 ，仿真加载了正确的库 Lucho, I don't believe there is a way of doing this. If you want to specify the threshold value, select user. I believe his is a rather tricky one. "aaa. You'll be glad to hear the answer is No! In Virtuoso® Visualization and Analysis, we have a Calculator function available called getAsciiWave, which will create a plot from your text file without the need to create a schematic or a Calculator function firstVal() returns the first x-value of a waveform. 1, which displays direct result (no need to subtract result again from 180) on ADE Outputs window. The expression calculates exactly what i want on a single run. Similarly, use the calculator phase function to determine the phase of the differential output response. This document is want to review the manual for your own handheld scientific calculator. dnl[k (or maybe k+1)] = (sig[k] - sig[k-1])/ideal_step - 1. If you want that the Virtuoso Visualization and Analysis XL calculates the threshold value, select auto. Hi Andrew, thanks for confirming my thoughts regarding pcRound I understand what you say regarding the rounding. the calculator number seems completely realistic. Can anyone tell me how to use it? Custom Layout SKILL Functions Reference July 2002 4 Product Version 5. The auto threshold is calculated as: Auto Threshold Value = integral of the waveform divided by the X range. cdsinit or . How can I do that? Simulations in Cadence yield very useful results. I get the following error: Hi all. Kindly, I need your help to make the ADE Assembler compute the calculator functions automatically after simulation termination. 51) will return 3 but round(3. I have a time difference amplifier which amplifies the difference between two signals, namely Start and Stop. or you can evaluate buffer by checking evaluate buffer check box. I use the settling time function in the calculator. Virtuoso Video Diary: Do More With eyeHeightAtXY and eyeWidthAtXY Calculator Functions in Virtuoso Visualization and Analysis XL 17 Dec 2021 • 3 minute read We live in a world where the idea of usability is to With the help of our online function calculator, you can get instant solutions and repeat the process for an unlimited number of questions. Virtuoso ADE L calculator - delay function - Variable value in threshold field. For You already can give time arguments to the clip function, so I just don't get what you're asking for? Regards, Andrew. Cancel; Hello Andrew,I am using ADE explorer,I am doing DC sweep from the calculator i have exported the expression of derivative of Ids as shown bellow. Then, you can enter the expression: abSetXUnits(pm) Hi, I have an expression setup in ADE-L using the sample function in the calculator. I then determine the length of the vector. Hello, I have a question about how to get x value for a given point of y in a waveform. I am also aware that cross function used here gives the user the choice for rising edge or falling edge. Then you can apply deriv to the result of this. enter into stact by pressing enter button. My problem is that, because of this, some PCells are not behaving in the same way for some of the parameters. I used the cross function to return the plot of the pulse vs temperature. --) Use Calculator in Cadence Virtuoso--) Verification. I don't think it can be used to draw the integrated waveform. Yes, but how do you get the average to output a time-dependent average waveform, and not a scalar? Cancel; Vote Up 0 Vote Down; I am doing a simple DC sweep & using the cross function in the calculator, i am finding the x-axis in my sweep range for a particular y-axis value. Dear all, I want to add a custom calculator function. The cross function in the module forces the simulator to place simulation timepoints at the crossings, which might significantly improve the accuracy of your results. My virtuoso version is IC6. If you have a question you can Often the simplest way of finding about a particular function in the calculator is to go over the function name in the panel and do Right Mouse->Help. Not really sure why that's a benefit or disadvantage! The calRegisterSpecialFunction is the old way of registering functions, and any form has to be a special "hi-like" form rather than the embedded forms within the calculator. Cancel; zzzzzzzzzw over Among Cadence Virtuoso Calculator functions, is there a function that returns the y value when given an x value? I know the "cross" function can return the x value when given a y value. My virtuoso version is 6. After Function: Virtuoso Virtuoso<ItemData, Context>(props): ReactElement<any, string | JSXElementConstructor<any>> Type parameters I'm trying to setup the interpolation point of the value function from a variable, I've tried this but it doesn't work: any idea on how I can achieve entering VAR("myvar") in the calculator returns the expected value @ Andrew: ICADVM18. The calculator value should be VT (“/output”). The functions delay() and riseTime() can be use to calculate the delay time, and rise and fall times, I tried the std function in the calculator but it seems to be taking all the waveforms and calculating the std along the xaxis into a single value, and convert the x axis to the monte carlo run which is not what I want. PI if we can access the attribute or function of the class directly and there's a class like Math? I used to def a global variable PI = 2*acos(0), as zmleitao did. may you check to see i understoor the concept of Sampling signal and threshod Sampling signal:It is the Most people tend to get on better with the expression builder as an efficient way of building complex expressions - and it's pretty powerful. Or maybe you really need a Calculator function to perform certain calculations but Cadence does not supply that function with the Calculator or Expression Builder? To address these issues, we have provided a new New: beginning with V0. In order to verify this, deriv function is used. However when I sweep a variable using parametric sweep the expression fails to evaluate on the multiple outputs. Case 1 - single event. Thank you for your help in advance. If you have a question you can I am using Cadence Virtuoso version IC6. 51) will return 4. 1; ADE XL $ virtuoso -W sub-version ICADVM20. I'll happily provide some context. Use this analysis to get noise digits (NF), noise factor, input/exit, Suppose I have an instance with input signal vin and output signal vout. The Virtuoso® Analog Design Environment User Guideexplains how to design and simulate analog circuits. Also the fix() function can be used to truncate the fraction part. 9 is my threshold value. In this document: Virtuoso Spectre Transient Noise Analysis The PN() function is used to calculate the phase noise after transient simulation with this equation: (p. Setting the cyclic pulldown on the function panel at the bottom of the Calculator to All will display a long list of over a hundred functions for your use. the Calculator windows shows up, however when I Virtuoso Visualization and Analysis XL User Guide -- Calculator Functions - Calculator Functions I believe the SKILL code for each function is proprietary. Now,my problem is that when I execute the command "virtuoso -nograph -replay skill. I am using IC6. now its time to configure the psd function. In chapter F "Working With Function Templates" of Virtuoso Visualization and Analysis XL User Guide, there is an example, which may show what I need: START OF CITATION. Locked Locked Replies 1 Subscribers 117 Views 3853 Members are here 0 The functions loaded via this extra file show up in red in the calculator rather than blue. 6 I hope I explained the problem clearly Thank you in advance Regards. 01 to 1. Cancel; Vote Up 0 Virtuoso Visualization and Analysis XL User Guide Product Version 6. Free functions calculator - explore function domain, range, intercepts, extreme points and asymptotes step-by-step Is there a way to plot different virtuoso calculator functions depending on simulation time? I have 3 modes/phases in my run. Kindly I would like to ask you how can I formulate the best fit line function in the cadence calculator for the purpose of simulating the sensor output linearity. However if I do the same with the calculator using waveVsWave, it will get the waveform families wrong, that is, it will connect the points to the points of another waveform instead of its own waveform. The expression I use is the following one: cross(VDC("/OUT_SF") 0. I would really appreciate if you can explain why that code is a better option for getting the time rather than the small command that can easily be done through Cadence Calc. select other wave. If VS("/OUT")/VS("/IN") has values from 1. cdsinit), there's not really a big need for an unregister function For this, I am using the 'cross' function from Cadence calculator. Joined Dec 29, 2009 Messages 187 Helped 57 Calculator sure has begun to suck, after IC5. 0 . I am applying the "imag" function to the magnitude signal and the result are the same, it shows both have the exact value as you see from the third image (result signal is the one with image fucntion applied) below is the admitance in magnitude here I sent the signal to calculator here is the result after calculator Thank you very much "cross" can get me the array of times I would like to sample, but I can't find a function that gives me the value of another analog waveform based on this array of times. Community Custom IC Design Advanced function with Virtuoso Cadence. Predefined Functions and Waveform (Calculator) Functions. Andrew Beckett over 4 years ago virtuoso. For example, the function will accept a transient waveform and calculate a moving average in a window twindow. How can I do that? Moreover, I would like to use the variables that I define in ADE L in the expressions inside MDL file. I think the calculator should have this function, but I checked xval function, it doesn't work for me Let me make my question more specific: for instance, if I sweep variable vinn, the circuit output is called vout, how we can find the vinn for vout = 2V? Choose the weightedTotalNoise function and fill in the form; you can press preview to see what the function will look like in the calculator. I want to measure the voltage of vin whenever vout crosses a certain threshold, e. 47) - result 145 Fixture: 145. The falltime function is documented this way: Virtuoso IC6. Thanks, Is it possible to plot the phase spectrum in cadece virtuoso? The DFT function in the calculator plots the amplitude spectrum, but how can I plot the phase? Basically, I am trying to calculate the power in a nth harmonic oscillator. opening tools-calculator and selecting ‘psd’ function from function panel below, I have set the values as shown below. I used the PSS+Pnoise analysis in ADE to plot the input referred noise of my op-amp. Explore calculator functions, variable declaration, and parametric analysis. ymax is to find the maximum y-value in a waveform, whereas max is a SKILL function which returns the maximum of all of the arguments. techingro Virtuoso Visualization and Analysis XL User Guide -- Calculator Functions - ymax. If there is no way to do it using the built-in calculator, I would like to write a custom SKILL calculator function to implement this functionality. Before I spend too much time trying to make it work, I have a basic question: is the calcVal function in principle thought for such use? In the manual I seem to see this is mostly used to pass variable values between tests, for calibration purposes. Hi Andrew, Thank you for the reply. Part of the trick in using this function is how to specify the time points. Diode analysis (DC, AC, Transient) 2. Is it possible to implement the same using veriloga code? 2. " 2. 3 to design a low noise operational amplifier. Thread starter deveshkm; Start date Aug 10, 2017; Status Not open for further replies. It is possible to clip a waveform along the x-axis using the clip function. This contains all the basics from the previous RAK but now includes information about the features added since then. Hi, I am running a dc simulation for Schmitt Trigger . The Virtuoso Visualization and Analysis XL User Guide provides information on both of these functions. My main goal is to find the critical path of my custom designed digital circuit. 12) onwards. Or launch Skill API Finder from CIW of Cadence dfII. Do you know if it is possible to write an expression with the calculator functions? you could modify the module so that it writes the sampled values to a file. 6V. i have designe the 16 bit adder (ripple carry adder ) using virtuoso (schematic) . Doing this man Dear community. Most calculator functions don't deal with lists, so we can use the SKILL length() function to measure the number of entries in the list. Probably worth contacting customer support to suggest this as an enhancement. Regards Re: anyone know bandwidth function in cadence? it seemed wro Thank you for your kindness, but maybe I didn't clearify it. Hello Everyone, I am using Cadence Virtuoso through a server (using Putty and Xming), on a Windows 10 laptop. where it states: "When you use this function to evaluate data for measurement across corners, a new key argument, overall, is added to this function. 2. It wouldn't be too hard to write such a function - that said, I think it would be a generally useful function to be able to sample a signal at the crossing point of some triggering signal. For help on any button or area, click the labels below. , bandgap voltage, Vbg). It needs the code from this post too (I made life easier for myself by reusing some of that code). Cadence Calculator Function for difference between two voltages. com Welcome to our site! EDAboard. For example, I'm doing a FFT with sample frequency of 8192KHz. I have used the cross() function but with the "cycle" argument in lieu of "time". About; Looking for a better way to calculate a function of a list Which other judges, in Virtuoso Visualization and Analysis XL User Guide Product Version 6. Therefore, to determine the magnitude of the differential output gain, use the calculator magnitude function. I'd also like to suggest a way to make your code more readable. And the bandwidth function is directly listed in it. Aug 10, 2017 #1 Reaction score 0 Trophy points 6 Visit site Activity points 615 For gm and gmoverid, there are functions available in calculator. 98 fails to evaluate and I get no answer. I use the new versions of calculator ---wavescane here. hikmetceliker over 4 years ago. Click vt for transient voltage and then select the output node in the schematic window. But I got on my own on how to use 'phaseMargin' function in Cadence ADE Calculator version 5. I have to use CTRL+Z to quit it and can continue to write other command. Re: [Cadence Virtuoso ADE Calculator] Difference btw Freq and Frequency Function? Surely read OCEAN manuals. As it is, you are returning the result of the print statement which is going to be t. in this video a detail analysis of calculator in cadence virtuoso has been discussed, extracting data in different format , operation on wave form and all Yes right. I know there is a difference in so called 'period jitter' and 'TIE' jitter measurement, but I am not sure which one to use when and which result is more accurate. Cancel; Vote Up 0 Vote Down; Cancel; BaaB over 8 years ago. 27 mmsim 21. ("/Pout") 0. 17-64b. 7 . 500. e. If I have a moment, I'll see if I have time to write a function to do this Also the OCEAN script output in ADE XL shouldn't be used for plotting things. cadence. 3 July 2004 Cadence Calculator Function for the difference between the abscissa of the intersection of two curves. 9 0 "either" t "time"), where OUT_SF is the output of my comparator and 0. I know what the equation/method should be, All calculator functions are available as scripted functions when using Ocean, so it's easier than working your way through their GUI. Products Solutions You can then have your waveform in the calculator, bring up the SKILL User Defined Functions, pick abApplyToWave, Take any output from your AC simulation - e. The block has 5 trim bits, and for each trim code, I want to sweep the temperature (say -40 to 125), and determine which trim code produces lowest Vbg spread over temp. This will generate a waveform with the x-axis values as the y-axis - and so it will give you a waveform of frequency versus frequency. Community Custom IC Design calculator delay function. Note that the function only appears in the functions panel from IC616 ISR12 (6. Stats. 3V (y-axis). I want to get a vector of pulse width values for a non-periodic square signal using Calculator. When I use xmin and xmax of the output. 00, then the function checking for a crossing at 1. Regards, Andrew. 5 January 2012 1. I can plot a different function for each one, but what I would ideally like is to have one plot showing function 1 up to sim time A, then function 2 from sim time A to sim time B, then function 3. 0 leAttachFig But sometimes the cross function returns -nil, and sometimes it fails to evaluate. Community Custom IC Design Calculator - Special Functions (xmin & xmax) Stats. com/thread/1397272?ContentTypeID=1 Mon, 26 Feb 2024 13:00:47 GMT 75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:5a4e5436-ca37-4271-8645-3a2f5ed68d05 I am trying to plot a phase difference between two sinusoidal signals in Transient Analysis using Virtuoso Waveform Calculator in Cadence. Could anyone help? Thanks a lot. I'm able to do it by using the fx button but I would like to know if there is a way to automatic define it in the "Skill User Defined Functions" (Function Panel) by using . Case 1 - 通过value、cross、clip等函数，可以提取和计算这些关键指标，为设计优化提供依据。 在使用 cadence virtuoso 仿真过程中我们经常会关注一些电路指标，比如：运放的增益、带宽、相位裕度；bandgap的温漂系数、振荡器 I have some user-defined calculator functions Ex. this is a "feature" of the stack operation of the calculator. Cancel; Vote *WARNING* The spectrum function is deprecated. Thanks in advance. A very simple way to do so is to define a simple veriloga model that performs the function 1/s. ** These steps are for open loop AC analysis, not stb. syafiq over 8 years ago. This makes me not quite comfortable. 7-64b. k. For example. Cancel; Vote Up 0 Vote Down; Cancel; liorscotland over 7 years ago. 89 calculator functions can operate on single waveforms as well as on parametric plots, multiple-parametric plots, and Monte-Carlo simulations. Everything was working fine and suddenly when I tried to open the Calculator, the windows is frozen, (i. I would like to implement the following functions of the calculator in an MDL file: - rshift (or any type of time shift) - settlingTime - firstVal - xval - xmin - ymin. The example you sent for me helped me a lot. If the input is a scalar and the overall argument is set to t, the ymax function returns the input scalar value. But, I could not find any function that can plot a phase difference . You then need to register the function in the calculator (Andrew includes this in the instructions in the comments header of the file) in the CIW: abRegMovingAvgSpecialFunction() Once the calculator is open, you can now utilize the function by providing a waveform followed by the period over which to compute the moving average. But what I need is the opposite - given x, return y. Please. Send the two waveforms that you want to plot versus each other to the calculator, and then on the waveVsWave form you can pick which you want as the x-axis and which you want as the y-axis. If you mean Calculator in Cadence ViVA or Wavescan, it has no relation to Cadence Spectre. Hi, I am simulating my design for a sweep in a range of different VDD values and I need to find the delay for a huge number of waveforms combined in a "family". Thank you. 10. But, how does the deriv 1) Does the cross function work for AC (VF) signals? 2) If not, is there another way I can achieve what I need - which is to extract the value of my variable at which the ac signal crosses a threshold? Looking forward to a response! PS: Using Virtuoso 6. Hi Faisal, I had a few minutes on a plane yesterday (I know how to have fun!), so I threw this together. g. 47 gets rounded to 146 If I know anything about rounding it seems that the fixture number is rounded correctly. then press plot it will plot the desired result in waveform window. You might want to take a look at this Rapid Adoption Kit: Virtuoso ADE Explorer and Virtuoso ADE Assembler Expression Builder. If you have a question on a specific function that is not answered to your satisfaction in the User Guide mentioned above, I might suggest you either contact Customer support or post a question on (The getAsciiWave function assigns a name automatically. example; Allegro: round(145. So the 1st and 2nd row in settling time function is: y, value is -1V . Composer) for schematic capture. Hence, the function, I believe, computes the total harmonic distortion in a manner consistent with the definition (given the FFT length). I wonder if my attempts of using 'yval' was totally off the target because of this. Do I have to ensure that the input signal to the bandwidth function is in a particular format like non db20 or only a magnitude function ? I am not familiar with writing functions for the calculator, but I suspect that you need to return the value calcluated. Please can you help me and send me an advanced tutorial on the use of this software or Calculator function that returns the sign of the number. I've attached a sample of the code below. common source amplifier, gain and bias point calculation. integration in cadence calculator I think that this function just "calculates" the value of the definite integral of the given signal on the specified interval. You can also just type these values in once you are familiar with the equation Anyway, rather than me writing an abSetName() function - actually it would be tricky to register this with the calculator because presumably you'd want freeform entry for the axis name rather than a cyclic field of predefined units, and if I use this way of registering the function it wouldn't surround the typed in name with quotation marks When I right click, on the results tab, the gmoverid result and plot all, it will plot correctly the gm/id curve in function of either W, L or vgs. I'm using cross() function to perform measurements in the following way: I had the following setting for the dft function in Cadence Virtuoso Calculator: But it gave me some negative values in the spectrum: So why there are negative values? Is there anything wrong in the dft function setting? Thanks. Regards, Hi All, I am trying to use the bandwidth function in Virtuoso calculator in IC6. I Hello, I am exploring the special functions in IC 6. . 217 and examples for the object system functions. https://community. and simulated please anyone know how to calculate the average power,static,dynamic power calculation. il" at the command line. I have also verified with 8*f_RF-9*f_LO that the function evaluates to 'nil' even though this is a positive frequency, and all other cases where the sum of the harmonic numbers is greater than or equal to zero evaluate properly as expected in ADE XL. Suppose I have an instance with input signal vin and output signal vout. Once you have clicked OK, the new function is shown in the Custom Function Per the manual (Virtuoso Visualization and Analysis XL User Guide, Calculator Functions, Special Functions, dnl), the calculation is pretty much what you have said. Please suggest Thanks a lot, DYL . However If you are using the Calculator to create the expression, there are some instructions in the functions to register the function in the Calculator. Figure 1. Why not just use the clip function? That's pretty easy to use and then is independent of the actual steps you took in the simulation. Then performed parametric sweep. It seems that defMathConstants() create an instance of a class, and the PI is a function of the created instance. Kindly advise. click ok and the autofilled expression will be inserted to the buffer. (xval did exist though). We do our best. Regards, Lawrence. then perform any function from calculator. Open the Calculator with ADE->Tools->Calculator. The "xval" function allows plotting mathematical functions as a function of either time or frequency, where "xval" becomes the independent variable of the expression being plotted. However, many quantities in circuit design have to be computed based on a simulation result. I found the thd() in calculator only has 5 arguments (e. Hello, Can anyone tell me how to use the function phaseMargin in the cadence Analog environment calculator? When i try to compute the Phase margin manually and compare it with cadence calculator, it doesnt match. Stack Overflow. cdsenv. Example: Imagine a DC voltage sweep from 1 V to 2 V and a resulting output waveform VS("/result") with some arbitrary data. I created a simple inverter and used xmin and xmax of the output signal. To install, use the fx button in the calculator function panel or in the ADE Expression Builder. about SKILL calculator functions, refer to the OCEAN Reference. However, you can switch to having the calculator instead if you wish: So I want to write a calculator function that takes the bus as an argument and returns a waveform that is a sum of bits plus offset (for example) sum=mybussumwith offset(VT("/a<4:0>") offset) The problem is that data structure of second argument and first as passed to the function in Assembler (when I do RMB click and plot) not the same. You probably first need to convert that bus of analog voltages into a bus - which you can do via the Measurements->Analog to Digital in ViVA (you can choose whether signed or unsigned, and the radix) and then having plotted that, you can take the resulting bus and do Right Mouse->Send to Calculator or Send to ADE to add into your output measurements. We will calculate rise time first. 1-64b. It gave me the pulse of the first We've updated the Virtuoso Visualization and Analysis Rapid Adoption Kit (RAK) for IC6. Locked Locked Replies 5 Subscribers 117 Views 26812 Members are here 0 This discussion has been locked. The script is successfully carried out,but the command is stuck in there like I run the virtuoso using "virtuoso&" at the command line. Edit The time domain signal is as follows But, I want to find out the settling time from -1V to 1V at 0. This is not what I want. Cancel; Vote Up There were some bugs introduced between ISR8 and ISR10 (fixed in ISR11) where if the arguments (in some cases) were supplied as documented, the functions did not work properly. zzzzzzzzzw over 3 years ago. Functions . Andrew Beckett has written a SKILL function that can imported as a custom function in the Calculator that creates a line using the first and last points of its waveform. I would like to apply a function (like slewRate or Welcome to EDAboard. SteveVrk over 3 years ago. Andrew. So before I get too deep into this, please tell me if I'm just misusing the function . Some Via testpoints are not on a 1 mil grid, and the round function in allegro seems to work differently than our manufacturer's fixture software round function. I am using Cadence Virtuoso IC6. acbalbason over 12 years ago. Now go to Special Functions in the calculator window and click on It would be possible to create a function to do this (I could write one easily enough), but I'm really not convinced you want to do that. However when I checked the calculator function panel, there was no 'yval'. However, when using the rmsNoise function in the Visualization and Analysis L Calculator , I am getting the following message in the CDS log: "rmsNoise(10 20k )" Hi ,all ！ I want to use the vfreq function in ADE Explorer calculator to create a curve similar to the one shown in the image below, but I encountered some problems. The ypm function returns complex numbers (versus frequency) and only when a complex expression is sent to the graph or a table does it automatically take the magnitude. Locked Locked Replies 2 Subscribers 117 Views 13930 Members are here 0 This discussion has been locked. Simply add sigma to the end of your procedure so it is returned instead and it may start working for you. 1. 6. 7. ) Then hit the plot button of the calculator, and your waveform will be plotted. The input-output characteristic of the amplifier is T=A(Stop-Start), where A is the gain of the amp, Stop-Start (or x in the above formula) is the time difference to be amplified, and T (or y in the formula above) is the amplified time. I have a question about the use of calculator functions. Hi All, I was wondering if there exists a way or a function from the calculator which will return if the number is positive or negative. Thanks. 02 will return -nil, but the function checking for a crossing at 0. Dear Shawnlogan Thank you very much for your answer I want to use INL function in the first post I copied wrong expesion DNL instead of INL function from calculator Of course, I also use DNL function after that. Hi Lawrence, I didn't notice that fix() will works on this condition. Percent is 0. Thanks Cadence® Design Framework II SKILL Functions Reference Product Version 6. Community Custom IC Design Maximum value of measurements set on Calculator. Isn't it more natural to use Math. slew rate calculation Hello everybody, When I tried to use "slewRate" function in waveform calculator of Cadence Analog Design Environment , I found I could get two different SR values for the same ramp of the same curve by using two options seperately, which are either "initial value Y at mode—Specifies the mode used to calculate the threshold value. Hello, I am having a problem to extract values from time domain simulation. Menus Mode buttons Special Functions menu I am using Virtuoso version IC6. To use it, use the "fx" button in the calculator function panel and navigate to the file - it will add the calculator UI too which works just like analog2Digital. I know that SPARQL defines a limited set of math functions which certainly don't include trigonometry functions. il". You Read and do your best. 8-64b. Next, In the Waveform Window, select the third to last icon that looks like a calculator, labeled "Calculator". 0. The resulting psd plot does seem like what I expected. 6 1 "rising" nil nil ) in the calculator for my first edge and send it to the ADEL output. The ViVA Calculator (which you showed in your screenshot of your first Forum post entry) provide access to the dft() function as well as to the psd() function. Analog Environment (Spectre) for simulation. dividing the power by 2*pi*Fc ? [Cadence Virtuoso] deriv function. Each of the calculator functions has a corresponding SKILL command. May this reply help someone in future. And also, please help me with how to make the test circuit to find it. a) Select the transient output signal. Hello all, I have a combinatorial circuit with 8-bits of input and output buses and I am trying to find the delay between two buses. from, to, # samples, fundamental frequency). Hi, I am running a transient simulation for x seconds. Apr 22, 2014 #2 sarge Full Member level 3. Hello, Suppose I have multiple simulation outputs, like /VA, /VB, VC<1> and VC<2>. Before running the Monte Carlo analysis, I do a simple dc simulation with Spectre. I'm getting my butt handed to me the calculator in Cadence Virtuoso IC6 and I can use some help, please. 8 and ICADVM18. The functions have The Cadence Calculator is a powerful tool inside Virtuoso that allows you to apply a wide variety of mathematical formulas and functions to signals from your schematic. Respected Sir/Madam . As a semantic database, I have Virtuoso, and I want to use Virtuoso's trigonometry . But the answer gives me ERROR. I would like to add these functions to the function panel in the calculator. a. Then the 3rd and 4th row in settling time function is: y, value is 1V . one thing that might be noteworthy is that in the virtuoso calculator guides that I found on the internet seemed to state the existence and usage of 'yval' function. com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals and Will a calculator function called frequency, computes the frequency of oscillation from the transient response? The frequency function will tel you the average frequency of a transient waveform - so you'd want to leave it to settle, and then clip out a few cycles and use frequency. Hi Andrew, I was also searching for the same answer and came across this thread. I would like to find the maximum difference between the applied input voltage and obtained output voltage over the duration of the x second transient simulation. How do I perform a clip along the y-axis? I'm trying to separately take the integral. It returns a list of two numbers (the slope and the intercept), and the calculator and ADE outputs aren't really designed to receive a list. Make sure you read that part carefully. I have a block the output of which is the signal of interest (e. A second function is provided to compute the range, min or max at each sample point within the period. #cadencedesignsystems #virtuosos #icdesign #integratedcircuits #analogic #amplifier Virtuoso Schematic (a. Apparently, it is possible to format the output, such that unlike the simple order of function name and. 2% settling time. To run virtuoso, now go to cds directory: (always run virtuoso in the cds directory) cd cds And open virtuoso: (by adding & you can use virtuoso and xterm and the same time) virtuoso & Make sure you can see those NCSU_XX libraries and then you’re all set! Virtuoso XL Calculator Multiple Expressions. Then I calculate the AMAM (single tone amplitude distortion) by plotting (PowerGain_vs_InputPower)-(PowerGain@-30dBm). Is there a way to plot different virtuoso calculator functions depending on simulation time? I have 3 modes/phases in my run. As an alternative, ViVA offers the Spectrum Assistant which is Both sample() and value() are not functions of Cadence Spectre. 5 January 2012 Recently I was also facing the same problem. Cancel; Vote Up 0 Vote Down; Cancel; kbhow over 15 years ago. Sorry for the mistake. jtsivv eaxxhm rpcyjs fwna nfvy dhjnn kmlv oeztrmn kyqm qrym