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PSS/PAC and PSTB for Fully Differential SC CMFB Opamps

Hello,

I want to characterize a Fully Differential SC CMFB Opamp (or any fully differential opamp) with PSS/PAC and STB analysis.

Is there a RAK/Video Tutorial that outlines the process of how to do this in Virtuoso/Spectre.

Thank you.

Andrew Beckett over 7 years ago

We don't have a RAK on doing this for a switch cap amplifier, but we do have one for continuous time amplifiers: Operational Amplifier (OpAmp) Stability, CMRR, PSRR, Noise, Slew Rate, THD, Compression Distortion Measurements and a video: Determining the Circuit Stability Using Stability (stb) Analysis (Video)

You could look at the Simulating switched-capacitor filters with SpectreRF on the Designer's Guide site. Also, a general coverage of PSS/PAC etc can be found in the Spectre installations at <SPECTREinstDir>/tools/spectre/examples/SpectreRF_workshop/rfworkshop.tar.Z - this contains information on how to analyse a variety of circuits with SpectreRF analyses. It doesn't really have a switch-cap emphasis (it's more RF-focused) but hopefully between the document on the Designer's Guide site and the RF workshops you should be able to work this out.

Or contact your Cadence account team - I'm sure we could help you get started (I don't have a example myself for the kind of circuit you're talking about, but we have other switch cap examples that we could use to illustrate this).

Regards,

Andrew.
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