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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> Vgd in breakdown in PSS analysis of VCO https://designers-guide.org/forum/YaBB.pl?num=1232695231 Message started by gorkhim on Jan 22nd, 2009, 11:20pm |
Title: Vgd in breakdown in PSS analysis of VCO Post by gorkhim on Jan 22nd, 2009, 11:20pm Hello, I am trying to design a VCO with a nanowire transistor (Operating Freq = 100G). Breakdown voltage for the transistor is 1.5V. I used 1V VDD and got 1Vp-p swing for transient analysis. When I started PSS, it gives warning for "Vgd in breakdown." I designed to have 600mVp-p swing and still get the same warning. Does anyone suggest me why I am getting such warnings in PSS not in transient? |
Title: Re: Vgd in breakdown in PSS analysis of VCO Post by vivkr on Jan 22nd, 2009, 11:38pm Have you tried to plot the transient waveforms from the PSS analysis? I would look at those, including the initial transient results which are not saved by default (you need to enable that option in the PSS form). I sometimes had the problem that spectre issued a warning about some oxide breaking down etc, but the voltages were never large enough for that. I did not see this in PSS but in plain transient sometimes. Best regards, Vivek |
Title: Re: Vgd in breakdown in PSS analysis of VCO Post by pancho_hideboo on Jan 23rd, 2009, 3:27am gorkhim wrote on Jan 22nd, 2009, 11:20pm:
If such warnings are reported only during shooting newton iterations, generally you can ignore these warnings. But if you see such warnings even in steady state, there exists a real problem. http://www.designers-guide.org/Forum/YaBB.pl?num=1228240587/5#5 |
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