This is a question I wanted to ask after I have observed much more noise when I swap a filtered traducer's output to a single ended data acquisition board. A transducer outputs Vs1 signal. The transducer is basically a strain gauge with an amplifier and powered by an SMPS supply.
So in Figure1, Vs1 is the transducer output signal, Vdn1 is the differential noise and Vcm1 is the common mode noise. R1 and C1 forms a low pass filter. Rin is the input impedance of the data acquisition input.
In Figure2 everything remains the same but the inputs to the DAQ are swapped.
When I simulate this, I get much more common mode originated noise in Figure2.
Is that correct to say for such circuit setup in Figure2, if we swap the inputs common mode noise component will increase. Am I modelling the issue and interpreting what happens correct?