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https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> how to plot intrinsic frequency ? https://designers-guide.org/forum/YaBB.pl?num=1112889742 Message started by nus_lin on Apr 7th, 2005, 9:02am |
Title: how to plot intrinsic frequency ? Post by nus_lin on Apr 7th, 2005, 9:02am Dear andew and ken, last time i ask how to plot gm over I, and what you told me did work. however, plotting intrinsic frequency over I is much more complex. can you spend some time to drop down your solution? i am using analog artist with simulator=spectre. btw, may i save an expression base on a transistor's op point? say gm/cgs? |
Title: Re: how to plot intrinsic frequency ? Post by Andrew Beckett on Apr 7th, 2005, 1:12pm I don't know exactly what you mean by intrinsic frequency (please elaborate), but answering your second question might answer it for you. You don't need to save an expression in spectre, but if you do: Code:
or just: Code:
(which will save all operating point data for a specific transistor), you can then compute gm/cgs in the calculator. If you can plot gm versus I, and cgs versus I, then in the calculator dividing the two will give gm/cgs versus I. Whatever calculation you need to do to compute intrinsic frequency, can be done in this way. Regards, Andrew. |
Title: Re: how to plot intrinsic frequency ? Post by James on Apr 7th, 2005, 6:38pm Do you mean intrinsic frequency "gm*ro"? |
Title: Re: how to plot intrinsic frequency ? Post by nus_lin on Apr 7th, 2005, 7:13pm James wrote on Apr 7th, 2005, 6:38pm:
this is intrinsic gain. |
Title: Re: how to plot intrinsic frequency ? Post by James on Apr 7th, 2005, 7:22pm Then what do you mean intrinsic frequency? |
Title: Re: how to plot intrinsic frequency ? Post by nus_lin on Apr 8th, 2005, 12:41am ideally, it is the frequency that the gain of input current equals to output current. |
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