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DC SWEEP COMPONENT VARIABLE

joaopaulo

I have a ring oscillator CMOS that i would like to sweep the values of transistor's width, lets say, from 500n to 10u, and i would like to plot the frequecy of that oscillator x width, opening the calculator and using the function "frequency" of a VT value, but it is not working, i guess because when i use DC sweep, the simulator doesn't calculate the VT value and therefore doesn't calculate the frequency. There is any way of plotting the frequency vs width?
In cadence Virtuoso , Ade L , XL or GXL 

Sorry, i am a begginer 

  • Well, you can't compute the frequency from a DC analysis given that there's no time-varying signal being produced. You would need to run a transient (could also potentially run a PSS or HB analysis too, but let's assume it's a transient). If you then want to sweep a transistor width, you could do that with a variable sweep or parameterisation in ADE Explorer/Assembler. You can do the same sweep in ADE XL (or you could set a variable on the width and sweep using Tools->Parametric Analysis in ADE L). 

    Either way, this needs to be a sweep around a transient analysis - it can't be a DC sweep.

    Andrew.

  • in reply to Andrew Beckett

    Thanks you , i did it after a while ( i swept 200 Points so took a lot of time )in Ade L the way you Said, but thank you for Sharing multiple others because my teacher adviced me to learn how How to use Ade XL and you helped a lot but saying How to do it in XL because it took me a few hours to search on YouTube How to do It in Ade L . Next step i will try tô sweep 2 Parameters , and make a grid with width and length , probably i will export data to Matlab to plot in 3 D , Thank you for your support ! 

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