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If I have a function, how can I plot the waveform in cadence

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Muaayad

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If I have a function (say Id=w.Pc.(Vgs-Vt)^2), how can I plot its waveform in Cadence, can I do this by the Calculator and how I can do it? {say I have all the values and want to plot Id for Vgs from 0 to 1.8}
 

Re: If I have a function, how can I plot the waveform in cad

Hi, here is the method I would use.
Say you have made a DC analisys where you swept Vgs from 0 to 1.8V, and that you named the net Vgs. Open the calculator and then click on browser. If you use spectre browse down into schematic/psf/Run1/dc-dc and select the net named Vgs. In the calculator something like:
v( "/Vgs" ?result "dc-dc" ?resultsDir "..." )
should appear. Then you just need to add the rest of your equation:
w*Pc*(v( "/Vgs" ?result "dc-dc" ?resultsDir "..." )-Vt)**2
with the numerical value for w, Pc and Vt, and click on plot.

Maybe there is another way, but I don't know it.
Hope it helps
regards.
 

Re: If I have a function, how can I plot the waveform in cad

Use the parametric analysis.

Steps:
1. you do a DC analysis. Then open calculator, click on "op" open botton, then window will pop-pup.

2. Click the tranistor whose vgs you need. then click the list botton of the pop-up window of step1.

3. the ("/op/MN0..","vgs") will appear in your calculator window.

4. analog simulaton evnivronment --> output --setup, click the get experssion.

5. Do parametric ayalysis.analog simulaton evnivronment --> tools-->
Setting your Vgs.. then start....

That is fun.
 

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