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Modeling >> Behavioral Models >> Modeling Settling Time of OTA
https://designers-guide.org/forum/YaBB.pl?num=1136284422

Message started by packiaraj on Jan 3^rd, 2006, 2:33am

Title: Modeling Settling Time of OTA
Post by packiaraj on Jan 3^rd, 2006, 2:33am

Hi Forum,
Slewrate can be modeled by (Imax/Cc) maximum current limitation and Compensation Capacitance of OTA. But I am wondering how to model settling time which includes Slew Rate limitaion (Non-Linear portion - initial part of settling); Phase Margin at UGF, Parasitic poles and pole-zero doublet if any (Quasi Linear portion- later part of setlling) .......I want to see effect of these in Transient Simulation. Any idea or suggestion is most welcome.

Thanks,
-Packiaraj.V.

Title: Re: Modeling Settling Time of OTA
Post by Andrew Beckett on Jan 3^rd, 2006, 9:34pm

Only time for a quick answer...

Have you looked at the Ideal/Non-Ideal opamp model in the Cadence "modelwriter" tool. This might be a good place to get some hints from, in the code it produces?

Regards,

Andrew.

Title: Re: Modeling Settling Time of OTA
Post by packiaraj on Jan 5^th, 2006, 8:07pm

Hi Andrew,
Thanks ...."Model Writer" generated code includes Slew Rate........ but not settling time

- Packiaraj.V.