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Simulators >> Circuit Simulators >> What is "cddbi" is op. report in Spectre??
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Message started by Yutao Liu on Apr 1^st, 2010, 8:28pm

Title: What is "cddbi" is op. report in Spectre??
Post by Yutao Liu on Apr 1^st, 2010, 8:28pm

Hello everyone,
I use Spectre Version 6.2.0.420. I found parameter "cddbi", "cbdbi" and "cbsbi" in the operating point report. what do they characterize?

And I have read the reply from Andrew about the map between 4.4 and 4.4.1 BSIM3V3 models in spectre. But I am still wonder the relationship between "lx33" in Hspice and capacitor parameters in Spectre?? According to my simulation, "cdd" is much less than "cdtot", but they both represent the dQ_d/dV_d.

Thanks very much.
Yutao

Title: Re: What is "cddbi" is op. report in Spectre??
Post by Geoffrey_Coram on Apr 5^th, 2010, 5:39am

cdtot will include cgdo (gate-drain overlap capacitance) and cjd (body-drain junction capacitance).