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.

Electrons

Required number input.

Incident Photons

Required integer input.

Photon-to-electron quantum efficiency from counted collected electrons and incident photons. 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]

Quantum Efficiency Percent (%)

The resulting quantum efficiency percent returned as a number.

• Photodetector responsivity, detectivity, quantum efficiency, and noise-equivalent power depend on wavelength, bandwidth, area, bias, temperature, optical coupling, and the stated noise model. Datasheet conditions must match the intended measurement.
• 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.

• Detector Responsivity Vs Wavelength

  Ideal photodetector responsivity from external quantum efficiency and incident wavelength.

• Photodiode Responsivity (Electronics)

  Compute photodiode responsivity in A/W from quantum efficiency and wavelength.

• Directivity From Gain

  Recover antenna directivity as directivityDbi = gainDbi - 10 * log10(efficiencyFraction), with efficiency defaulting to 0.6.