The common mode rejection for most op-amps is typically between __________(a) 10-50dB(b) 20-40dB(c) 60-90dB(d) 100-120dBThis question was addressed to me during a job interview.Question is taken from Sources of Noise in Low Level Measurements in division Recording System of Biomedical Instrumentation

The common mode rejection for most op-amps is typically between ______

1.	The common mode rejection for most op-amps is typically between __________(a) 10-50dB(b) 20-40dB(c) 60-90dB(d) 100-120dBThis question was addressed to me during a job interview.Question is taken from Sources of Noise in Low Level Measurements in division Recording System of Biomedical Instrumentation
Answer» RIGHT choice is (c) 60-90dB To elaborate: The common mode REJECTION for most op-amps is typically between 60 DB and 90 dB. This may not be sufficient to reject common mode noise generally encountered in biomedical MEASUREMENTS. Also, the INPUT impedance is not very high to handle signals from high impedance sources.

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