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Subject: Re: Push-pull OTA small signal model

Date: 08/30/03 at 3:50 PM
Posted by: Russ Kincaid
E-mail: russlk-nosapm[AT55]yahoo.com (replace [AT55] with @ to reply)
Message Posted:

In Reply to: Push-pull OTA small signal model posted by Jason on 08/30/03 at 1:09 PM:

In the push-pull model, the signal amplitude at M3, M6, and M7 is small, so the effect of stray capacitance is small and can be neglected. The signal at M8 and M5 drain is (hopefully) large so the stray capacitance must be considered.

In the single transistor model, signal input is to the gate, so capacitance relative to the gate must be considered. The signal on M3, M6, M7 and M8 gates is small, so the Cgs can be neglected.


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