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building an instrumentation amplifier from discrete components

Question asked by danyvak on Feb 17, 2014
Latest reply on Feb 18, 2014 by harryh

Hi!

I have some doubts about building an adc driver.

I have to build an amplifier for the differential adc. The sensor is geophone.

The design should have lowest noise and lowest power consumtion.

 

 

I can use an instrumentation amlpifier ad8422 with some operational amplifier to create a differential output.

 

 

or i can use a ADA4084 (dual version) in order to build a first stage of the instrumentation amplifier from the discrete componentds.

 

 

The gain of the amplifier should be about 1000.

 

 

I don't care to much about the offset because of the HPF in the dsp algorithm .

 

 

I will be thankful for any suggestion .

 

 

best regards

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