Op Amp CMRR calculator | Op Amp CMRR formula
This page covers Op Amp (Operational Amplifier) CMRR calculator. It mentions Op Amp CMRR formula used in this CMRR calculator. The CMRR stands for Common Mode Rejection Ratio. Refer Op Amp for more information on Operational Amplifier basics.
CMRR Calculator #1 Using Ad and Acm in numerical
Following calculator uses numerical values of Ad and Acm for CMRR calculation.
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 dB
Following calculator uses decibel (dB) values of Ad and Acm for CMRR calculation.
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
Following Op Amp CMRR formula or equation is used for calculations by this CMRR calculator.
CMRR is defined as ratio of differential Gain (AD) to Common Mode Gain (ACM). For 741C Op-Amp, it is typically 90 dB.