Re: difference between instrumental amplifier and operational amplifier

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#881

From: Bill Sloman
Date: Mon, 06 Mar 2000 00:00

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In article <89smse$fkl$1@news.cz.js.cn>,
  "peter" <asdc@bigfoot.com> wrote:
> Hi,can anyone tell me what's the general difference between
> instrumental amplifier and operational amplifier? what kind
> of application does each amplifier designed for?what kind of behaviors
> or characters we could expect when using them in application

An instrumentation amplifier uses three op amps - two non-inverting
buffers of equal gain (usually unity) and one subtractor - to output the
the difference in the voltage at its two inputs as a voltage referrred
to local ground.

It is used to reject common mode noise - usually 50/60Hz voltage
differences between physically separated grounds.

--
Bill Sloman, Nijmegen

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From: Bill Sloman <bill_sloman@my-deja.com>
Subject: Re: difference between instrumental amplifier and operational amplifier
Date: 2000/03/06
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