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.

Incident field (V/m) (V/m)

Required number input.

Transmitted field (V/m) (V/m)

Required number input.

Estimate electromagnetic shielding effectiveness from incident and transmitted electric-field amplitudes using 20 log10(Ein/Eout); both must use the same units. 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]

Shielding effectiveness (dB) (dB)

The resulting shielding effectiveness (db) 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.

• Equalizer Boost Db

  Convert an equalizer's high-frequency-to-reference voltage gain ratio to decibels; both gains must use the same amplitude convention.

• PSRR dB

  Compute the power supply rejection ratio in decibels as 20 x log10(delta Vsupply / delta Vout); both deltas must be positive.

• SINAD dB

  Compute SINAD in decibels as 20 x log10(Vfundamental / sqrt(noise^2 + distortion^2)); there must be some noise or distortion.