OPA2197-Q1: OPA2197-Q1

Hello Biswajit,

I don't find the circuit you show in the OPA2197-Q1 datasheet. Can you direct me to where you are finding that circuit? The closest circuit I find in the datasheet is Figure 8-4, a Precision Reference Buffer. What is your intended type of sensor?

Regards, Thomas

Precision Amplifiers Applications Engineering

Hi Biswajit,

it's a bit weirdly drawn by you, but this is the so called dual feedback technique to allow the driving of a heavier capacitive load.

You might want to watch this TI's training video series on stability:

training.ti.com/ti-precision-labs-op-amps-stability-introduction

Kai

Hi Kai

Sorry for my bad drawing and I don't remember the circuit reference ,while going through some thesis I found this circuit and it was required for my design .  ,this circuit is used for the supply to a resistive sensor in Wheatstone bridge configuration I have gone through the datasheet figure 8-4 ..the purpose of the circuit same ,and I have analyzed this circuit by finding the transfer function and I see it behaves like Low pass filter but my doubt is what is the purpose of using 49K here ?

Hi Biswajit,

why not watching the mentioned training videos? They do better explain than I could do:

https://training.ti.com/ti-precision-labs-op-amps-stability-isolation-resistor?context=1139747-1139745-14685-1138805-13953

Kai