slew rate of a fully differential amplifer

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EmbdASIC

Joined: 18 Feb 2006
Posts: 11
Helped: 1

13 Sep 2009 14:55 measuring slew rate fully differential opamp

Hello all,

Regarding measuring slew rate of single ended opamp its easy and straightforward, by giving a step on positive input and using opamp a follower.

But i was thinking how would it be for a fully differential case?

Thanks and look forward for some replies!

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dick_freebird

Joined: 04 Mar 2008
Posts: 312
Helped: 45
Location: USA

14 Sep 2009 0:19 edaboard slew rate

It should be fundamentally the same, except that both
input and output signals are now a signal pair with a
common-mode reference. Your input stimuli would be
a pair of sources (VP -x to +x step, VN +x to -x)
stacked on a third (VCM). The output you might find it
convenient to run throuch a vcvs to make a single
ended, ground referenced quantity.