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[DPRG] Analog Gurus needed
Subject: [DPRG] Analog Gurus needed
From: Jeff Koenig
koenig.jeff at gmail.com
Date: Tue Nov 28 15:20:09 CST 2006
Hello Rick,
Will a Summing amplifier work?
http://www.ecircuitcenter.com/Circuits/opsum/opsum.htm
It inverts, but the gain is 1. You can add another unity-gain
inverting stage if you need to.
Do you have a negative rail for your voltage supply, or only a
positive supply and ground?
-Jeff
On 11/27/06, Rick Bickle <rbickle at intconsys.com> wrote:
>
>
>
> Hey all,
>
> Here's a question for all you analog gurus out there.
>
> I am trying to design an amplifier to take a differential output signal of 0
> to 10mV, to a ground referenced signal with a range of 5mV to 3.3V.
>
> The tolerance of the input is +/- 2mV, which means that the input could go
> negative at minimum readings.
> An instrumentation amp will handle the differential to ground referenced
> conversion, but I need to add a positive offset of 5mV or so before I
> amplify the differential signal.
>
> How can I add 5mV to the input signal without adding gain?
>
> Your help is much appreciated.
>
> Thanks,
> Rick
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