Hello, in the attached image there's a RFI filter to prevent high frequency radio signals to reach InAmp inputs.
All is clear to me except the purpose capacitor C2, because R1 and C1 alone provide high frequency rejection while letting lower frequency signals through.
It's mentioned in the book where i found this circuit that it reduces amplifier's common mode rejection errors due to components mismatching(R1a C1a and R1b C1b) , but i dont understand how..could you explain?
All is clear to me except the purpose capacitor C2, because R1 and C1 alone provide high frequency rejection while letting lower frequency signals through.
It's mentioned in the book where i found this circuit that it reduces amplifier's common mode rejection errors due to components mismatching(R1a C1a and R1b C1b) , but i dont understand how..could you explain?
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