Using INA128P instrumentation amplifier

[ashrocks]

ina128p

I am trying to amplify low power signals from pressure sensors.
I used INA128P instrumentation amplifier, but the question is to use a negative or a positive feedback to the amplifier or simply ground the V- of the amplifier input?
Any help will be appreciated.

 

[FvM]

ina128p application

The purpose of an instrumentation amplifier is to measure a difference signal connected to Vin+ and Vin-. Why do you want to ground the input? If you have a signal ended input signal, you can go for a simple precision OP as OP07. But of course, it's no problem to ground either Vin+ or Vin-, if it's required by your application.

Feedback is provided internally in INA128, no external feedback required.