Problem of filter network with two probes

sfcsdc

Problem of filter network with two probes [Copy link]

As shown in the picture, what role does the capacitor in the blue box play?

For these two detection quantities that need to be subtracted, adding this capacitor can improve the ability to suppress common-mode noise?

maychang

The two capacitors in the blue boxes are used to filter out the high-frequency components in the differential signal.

sfcsdc

maychang posted on 2020-7-23 11:26 The two capacitors in the blue box are used to filter out the high-frequency components in the differential signal.

If it is a differential signal, it is indeed filtering out differential mode interference.

Allow interference on one channel to couple into another channel.

This can be cancelled out when doing the internal differentiation.