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.

Antenna temperature (K)

Required number input.

Receiver temperature (K)

Required number input.

Compute the system noise temperature in kelvin as the sum of the antenna and receiver noise temperatures; both must be non-negative. 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]

System noise temperature (K)

The resulting system noise temperature 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.

• MDS Calculator

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  Calculate junction-to-case thermal resistance from junction and case temperatures under steady dissipated power; junction temperature must be no lower than case temperature.

• THD Percent

  Compute total harmonic distortion in percent as 100 x sqrt(V2^2 + V3^2) / Vfundamental; harmonics must be non-negative and the fundamental positive.