Op Amp CMRR Calculator and Formula

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This page provides an Op Amp (Operational Amplifier) CMRR calculator and explains the Op Amp CMRR formula used in the calculator. CMRR stands for Common Mode Rejection Ratio.

CMRR Calculator - 1: Using Ad and Acm in Numerical Form

Inputs

Outputs

This calculator uses numerical values of Ad and Acm for CMRR calculation.

EXAMPLE:

  • AD = 2
  • ACM = 10000

OUTPUTS:

  • CMRR (Numerical) = AD / ACM = 0.0002
  • CMRR (dB) = 20 * Log10(CMRR(Numerical)) = -73.97

CMRR Calculator #2: Using Ad and Acm in dB

Inputs

Outputs

This calculator uses decibel (dB) values of Ad and Acm for CMRR calculation.

EXAMPLE:

  • AD in dB = 6
  • ACM in dB = 80

OUTPUTS:

  • CMRR (dB) = 6 - 80 = -74 dB

Op Amp CMRR Formula

The following Op Amp CMRR formula or equation is used for calculations by this CMRR calculator.

op amp CMRR formula

CMRR is defined as the ratio of differential Gain (AD) to Common Mode Gain (ACM).

For a 741C Op-Amp, the CMRR is typically 90 dB.import CMRRCalculator from ”./elements/CMRRCalculator.astro”; import OpAmpCmrrCalculator from ”./elements/OpAmpCmrrCalculator.astro”;

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