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From: Spehro Pefhany
Subject: Re: CMMR op amp outside voltage rails ?
X-Newsreader: Forte Agent 1.92/32.572
Date: Thu, 05 Dec 2002 19:22:38 GMT
NNTP-Posting-Date: Thu, 05 Dec 2002 14:22:38 EST
On Thu, 5 Dec 2002 19:14:53 -0000, the renowned "John Jardine"
>Sorry-- I've no ideas, but I was just for interest wondering how you've
>arranged that 1st op-amp?.
>(As I read it). If you've got a 0V and +5V supply for the 3 op-amps they can
>be asked to work at bottom end with (say) a -5V signal and a -4.99V signal.
>How are you removing the negative common mode offset voltage if the amps are
>run from 0-5V?. (I'm assuming all the voltages are not isolated from each
Presumably he's dividing it down to get it within the CM range, but
that requires the input offset voltage to be in the microvolts for
the output offset he mentions at highest gain.
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