Re: Choosing voltage opamp

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#2050

From: redbelly
Date: Sun, 24 Sep 2006 21:37

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Dana wrote:

> True. But I think Dave was saying that with a +/- 5v supply, the output
> would only be able to get a 5v p-p signal. I would think it would get close
> to both the 5 and -5 supply giving close to a 10v p-p output.
> Like the original poster mentioned when he observed an approx 8v p-p output.
> And back to the original poster, yes if he required an absolute minimum of
> 10v p-p out, yes his rail supplies would have to be in line with that
> requirement.
>

Most op-amps clip the signal when the output is within 2 volts (or so)
of the + or - supply.  Hence the need for special "rail to rail" op
amps, which can get much closer to the supply voltage before clipping
(tens or hundreds of mV?)

The problem is worse the higher the output current, and the OP's desire
for 200 mA is a high current for an opamp.

Mark

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From: "redbelly" <redbelly98@yahoo.com>
Newsgroups: sci.electronics.design,sci.electronics.basics,aus.electronics
Subject: Re: Choosing voltage opamp
Date: 24 Sep 2006 14:37:20 -0700
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