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From: Winfield Hill
Subject: Re: Rail to Rail Limit
Date: 27 Sep 2002 09:26:00 -0700
Organization: Rowland Institute
X-Newsreader: Direct Read News 2.98
John Woodgate wrote...
> Kevin Aylward wrote...
>> Rolf Michel wrote
>>> how far can i use the rail to rail function of an operational
>>> amplifier. i have 3 volt single power supply and an input signal
>>> range from 25 to 100mV. I'd like to gain with 25. Does this
>> work with a rail to rail op or does they have some distortion.
>> A rail-to-rail amp can swing quite near the rail without gross
>> distortion. How much depends on your application, e.g. load current.
>> With light loads a few 10's mv is usually doable.
> I bet his 100 mV is an r.m.s value, and he wants a gain of 25 applied
> to it. That's a peak-to-peak output voltage of 7 volts! NO WAY with
> a 3 V supply.
It can be done, I know a way, but not with a rail-rail opamp. :-)
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