Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Differential gain

Required number input.

Common mode gain

Required number input.

Compute the linear common-mode rejection ratio as Adiff / Acm; the common-mode gain must not be zero. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

CMRR (ratio)

The resulting cmrr returned as a number.

• EMI attenuation and protection calculations depend on source and load impedance, parasitics, layout, enclosure seams, cable coupling, frequency, pulse shape, and test standard. Component impedance curves alone do not demonstrate emissions, immunity, or ESD compliance.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• CMRR dB

  Compute the common-mode rejection ratio in decibels as 20 x log10(differential gain / common mode gain).

• Instrumentation Amplifier Cmrr Calc

  Common-mode rejection ratio in decibels from measured differential and common-mode voltage gain magnitudes.

• Effective Aperture

  Compute the antenna effective aperture in square meters as Ae = lambda^2 x G / (4 x pi); wavelength and linear gain must be positive.