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how the cmdmprobe works? (Read 6312 times)

NeilYu New Member Offline Posts: 3	how the cmdmprobe works? Feb 29^th, 2012, 7:12am hi all, I try to understand the cmdmprobe in analogLib by raturn ratio method. But I have a question why the pcccs source is added in it. Thanks, Neil
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sheldon

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Re: how the cmdmprobe works?
Reply #1 - Feb 29^th, 2012, 5:02pm

Neil,

�Which version of MMSIM are using? From MMSIM 10.1(?),
a new component has been released and it is the
recommended element for differential stability analysis,
the diffstbprobe. The cmdmprobe is still supported for
backwards compatibility.

� � � � � � � � � � � � � � � � � � � � � � � � � � � � Best Regards,

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � �Sheldon

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NeilYu

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Re: how the cmdmprobe works?
Reply #2 - Mar 1^st, 2012, 7:08am

Hi �Sheldon,
Thank you very much for your comments.
I asked the question because I found that the DC loop phase is zero degree(180deg is reasonable). So I try to understand how the cmdmprobe works and I wonder why CADers add the pcccs. Due to the pcccs, the zero degree happens.
I just saw diffstbprobe in my version. But the details about diffstbprobe are not available. What's the difference between diffstbprobe and cmdmprobe?

Thank you very much & Best Regards
Neil

« Last Edit: Mar 2^nd, 2012, 5:29am by NeilYu »

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Frank Wiedmann Community Fellow Offline Posts: 678 Munich, Germany	Re: how the cmdmprobe works? Reply #3 - Mar 1^st, 2012, 7:40am The diffstbprobe has the advantage that it also works correctly for non-symmetrical circuits. See http://sites.google.com/site/frankwiedmann/loopgain#TOC-Loop-Gain-of-Differentia... for some details.
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