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ron and 1/gds of Cadence Spectre (Read 4901 times)

pancho_hideboo Senior Fellow Offline Posts: 1424 Real Homeless	ron and 1/gds of Cadence Spectre Nov 28^th, 2008, 2:01am Any expert of Cadence Spectre. Cadence Spectre give ron and gds as DC operation point of bsim3v3 MOSFET. Here ron is not eqaul to 1/gds. What is different between ron and 1/gds ? If I want to know an estimation of on resistance of drain and source, which value should I use, ron or 1/gds ?
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Geoffrey_Coram Senior Fellow Offline Posts: 1999 Massachusetts, USA	Re: ron and 1/gds of Cadence Spectre Reply #1 - Dec 3^rd, 2008, 5:44am I think ron = vds / id, in some sense the "large-signal" resistance, whereas gds is the slope of id with respect to vds at the operating point.
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pancho_hideboo Senior Fellow Offline Posts: 1424 Real Homeless	Re: ron and 1/gds of Cadence Spectre Reply #2 - Dec 3^rd, 2008, 3:55pm Geoffrey_Coram wrote on Dec 3^rd, 2008, 5:44am: I think ron = vds / id, in some sense the "large-signal" resistance, whereas gds is the slope of id with respect to vds at the operating point. Thanks for response. So ron is suitable than 1/gds for my application.
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