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Cadence Stability Analysis

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nile_king

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cadence stability analysis

Hi

Dear all

I wanna know how to use the stability analysis in cadence tools ?
i'm designing bandgap cts and wanna check the stability and don't know how??
i put an AC source in the loop that i wanna check its stability and run the STB analysis and the probe to this source but obtain no results
is there any problem in what i did??

thanks in advance
 

stability cadence

Insert a iprobe from analoglib into the loop and select that as your probe in the stability analysis. That should solve the problem. If not clear let me know
 
cadence stability

You will see the results if you go to results->direct plot->main form and choose stability analysis
 

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    nile_king

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check stability cadence

Thank you for ur help
it works now
BUT i see the phase margin and gain margin in negative is that mean wrong in the design ??
 

stability analysis stb

Hi

Is it must to open the loopin this analysis STB or the source inside the loop find the open loop gain and its phase margin

Thx
 

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