Anonymous
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Oct 11, 2013
06:01 AM
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Oct 11, 2013
06:01 AM
Hi,
I am trying to implement a differential amplifier to convert an input signal range of 1-5V to 0-4 V. I tried it using 2 back to back PGAs with first stage (Gain=1,ref Vss) providing 1V ref to second stage(Gain=1) to which input signal of 1-5 volts is applied.But this did not work as expected.
Has anyone implemented it before?Please help me out.
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3 Replies
Anonymous
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Oct 11, 2013
06:12 AM
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Oct 11, 2013
06:12 AM
Hi
What is "1-5V to 0-4V" ?
Be explain more in detail.
What is "1-5V to 0-4V" ?
Be explain more in detail.
Oct 11, 2013
06:48 AM
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Oct 11, 2013
06:48 AM
You cannot implement an effective diffamp using PGAs because their
gain accuracy tracking is so poor your CMRR will suffer, the whole point
of using a diffamp is CMR.
You are not using INSAMP module in the component catalog ?
Regards, Dana.
Oct 11, 2013
06:51 AM
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Oct 11, 2013
06:51 AM
Here is an analysis supporting prior post in thread -
http://www.cypress.com/?app=forum&id=2492&rID=82151
Regards, Dana.