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From: John Woodgate
Subject: Re: Rail to Rail Limit
Date: Fri, 27 Sep 2002 22:04:01 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Fri, 27 Sep 2002 21:10:17 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Winfield Hill
wrote (in ) about 'Rail to Rail Limit', on
Fri, 27 Sep 2002:
> 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. :-)
Indeed. One could get 7kV p-p with enough winding skill. (;-)
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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