Hello,

I have a concern with using a multiplexer. I want to build an EMG circuit with 4 pairs of electrodes but only want to use one differential amplifier there for, I want to use a multiplexer to switch from each pair of electrodes before going to the differential amplifier. Should I be concerned of the very small input voltage going in the multiplexer and then out?

Thanks

 

Normally no. A CMOS multiplexer looks like a small resistor in series with the signal when it is on. It adds no voltage of its own. But you should be concerned by noise pickup so you likely want all the circuitry shielded in a grounded metal box.