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[DPRG] Analog Gurus needed

Subject: [DPRG] Analog Gurus needed
From: Kenneth Maxon kmaxon at qwest.net
Date: Tue Nov 28 17:18:06 CST 2006

Here to you will need a negative rail for your op amp.  If inverted output
can not be used, a follow on inverter can be used.  If all you are trying to
do is remove an offset from a signal then make all the resistors the same
value, say ~10K.  Op-amp selection will depend on the speed of the signal
you are trying to monitor and other factors...



-----Original Message-----
From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org]On
Behalf Of Jeff Koenig
Sent: Tuesday, November 28, 2006 3:20 PM
To: Rick Bickle
Cc: dprglist at dprg.org
Subject: Re: [DPRG] Analog Gurus needed

Hello Rick,

Will a Summing amplifier work?


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?


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
> 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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