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From: "Frank Bemelman"
Subject: Re: Rail to Rail Limit
Date: Fri, 27 Sep 2002 19:56:45 +0200
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Organization: EuroNet Internet
NNTP-Posting-Date: 27 Sep 2002 17:58:08 GMT
"Winfield Hill" schreef in bericht
> 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. :-)
An opamp + little auto-transformer ?
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