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Op Amp CMRR calculator | Op Amp CMRR formula,equation

This page covers Op Amp (Operational Amplifier) CMRR calculator.It mentions Op Amp CMRR formula or equation used in this calculator. CMRR stands for Common Mode Rejection Ratio. Refer Op Amp for more information on Operational Amplifier basics.

CMRR Calculator#1 Using Numerical Values of Ad and Acm


Differential Mode Gain (Ad) :

Common Mode Gain (Acm) :


CMRR (Numerical) :

CMRR (dB) :

EXAMPLE Op Amp CMRR Calculator -1:
AD = 2, ACM = 10000
CMRR (Numerical) = AD/ACM = 0.0002
CMRR (dB) = 20*Log10 (CMRR(Numerical)) = -73.97

CMRR Calculator#2 Using Ad and Acm in decibel(dB)


Ad in dB :
Acm in dB :


CMRR (dB) :

EXAMPLE Op Amp CMRR Calculator-2:
INPUTS: AD in dB = 6, ACM in dB = 80
OUTPUTS: CMRR (dB) = 6 - 80 = -74 dB

Op Amp CMRR Formula or Equation

Following equation or formula is used for Op Amp CMRR Calculator.

op amp CMRR formula

It is defined as ratio of differential Gain (AD) to Common Mode Gain (ACM). For 741C Op-Amp, it is typically 90 dB.

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