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https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> Cgg vs Vgs for MOSFETs https://designers-guide.org/forum/YaBB.pl?num=1112723856 Message started by cricket_fan on Apr 5th, 2005, 10:57am |
Title: Cgg vs Vgs for MOSFETs Post by cricket_fan on Apr 5th, 2005, 10:57am Hi I am trying to look at the Cgg of a mosfet device. I am using Cadence dsign environment for this. When I do a dc sweep of the gate under various drain biases (linear/saturation) , how can I plot Cgg against Vgs using the calculator. I had done this before but using a raw netlist file and running spectre standalone (without Cadence) and it was possible to obtain Cgg as an output parameter. Any pointers/suggestions would be helpful. thanks MMN |
Title: Re: Cgg vs Vgs for MOSFETs Post by Andrew Beckett on Apr 7th, 2005, 1:25pm This has been answered several times before in this forum, albeit in a slightly different form. http://www.designers-guide.org/Forum/?board=rfdesign;action=display;num=1085050640;start=5#5 which in turn has a reference to another similar answer. Regards, Andrew. |
Title: Re: Cgg vs Vgs for MOSFETs Post by nus_lin on Apr 8th, 2005, 12:46am poor andrew, you have to answer the same question again and again, ;D hi, do you know the meaning of cgg, cgd, cgs, csg in the bsim3 model? why they are sometimes negative? if i want to manually find out the capacitance at one node, what should i do from the op point? |
Title: Re: Cgg vs Vgs for MOSFETs Post by Andrew Beckett on Apr 8th, 2005, 6:13am OK, prepare to be sympathetic to me again. This one I've answered at least twice: http://www.designers-guide.org/Forum/?board=analog_design;action=display;num=1087411058;start=1#1 http://www.designers-guide.org/Forum/?board=semi;action=display;num=1053460340;start=1#1 See that little magnifying glass, with Search written next to it at the top of the page... well, guess what it's for? (a search for "bsim3v3 negative capacitor" found the two links above). Andrew. |
Title: Re: Cgg vs Vgs for MOSFETs Post by cricket_fan on Apr 8th, 2005, 12:29pm Ignore previous message I found out how to get all parms. of individual MOS instances. thanks |
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