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.

Noise figure

Required number input.

Convert a system noise figure in decibels to a linear noise factor. 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]

Noise factor

The resulting noise factor returned as a number.

• Noise figure and noise temperature require a defined source temperature, bandwidth, gain convention, impedance match, and cascade order. Loss ahead of the first stage, frequency dependence, measurement uncertainty, and nonlinear operation can dominate receiver sensitivity.
• 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.

• Factor To Noise Figure

  Convert a linear noise factor to an equivalent system noise figure in decibels.

• Op-Amp PSRR dB to Linear

  Convert power-supply rejection ratio from voltage-ratio decibels to a linear rejection factor, 10^(PSRR/20). A 80 dB PSRR means a 10,000:1 small-signal voltage rejection at the stated frequency.

• SNR To dB

  Convert a linear signal-to-noise ratio to an equivalent ratio in decibels.