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From: John Larkin
Subject: Re: CMMR op amp outside voltage rails ?
Date: Tue, 03 Dec 2002 18:24:44 -0800
Organization: Posted via Supernews, http://www.supernews.com
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On 04 Dec 2002 00:30:40 GMT, email@example.com (Gibbo) wrote:
>I have simulated and breadboarded (they almost agreed !) an amplifier that we
>need with the following specs:-
>Differential voltage input of -60mV to +60mV
>This could be sitting on an offset between -5 volts to +50 volts
>Available power supply is a single rail 5 or 6v (not yet decided)
>Gain of 50 and 500 (switchable)
>Bandwidth DC to 1KHz
>Gain accurancy better than 1%.
>Offset accuracy less than 0.05 volts on the output.
>Temperature/time drift of offset is not such an issue as the micro periodically
>calibrates for this. Though of course it would be nice to remove this
>My solution uses 3 op amps. One of them to remove the offset on the input. One
>as the differential amp, and one for the gain There has to be a less
>I bet there's a single package that will do it all ?
Doesn't LTC make an 'over the top' opamp? And Burr-Brown makes a
diffamp that tolerates huge common-mode voltages.
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