I have a DiffAmp AD8132 following an OpAmp LT1818. A 1.5V voltage source, such as voltage divider, voltage reference, or voltage regulator should be connected to the B input pin of the DiffAmp to compensate for the offset of the original signal. I was wondering if output impedance of a voltage source would be as crucial as for Vref pin of the In-Amp, which is discussed in this thread.
I plan to connect the output of the OpAmp directly to point A, and a voltage source directly to the point B. If the impedance matter in this case too, then which voltage source would be the best choice? Do I need any additional compensation resistors before the A and B? The Vcm (pin 2) of the DiffAmp is set to 1.5V to provide a common mode signal at the output.