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.

Reference amplitude (V)

Required number input.

De-emphasized amplitude (V)

Required number input.

Express reduction from reference amplitude to de-emphasized amplitude as a positive voltage attenuation in decibels. 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]

De-emphasis attenuation (dB)

The resulting de-emphasis attenuation returned as a number.

• Compact electronics formulas omit some combination of tolerances, temperature drift, bandwidth, loading, parasitics, noise spectrum, nonlinearity, clipping, calibration, layout, and device-specific limits. Typical datasheet values are not guaranteed limits.
• 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.

• Pre Emphasis Db

  Express transmitted pre-emphasized signal amplitude relative to the baseline amplitude in voltage decibels.

• Equalizer Boost Db

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

• Decibel Voltage Ratio Calculator

  Compute an amplitude ratio in decibels across equal impedances, dB = 20 * log10(V2 / V1); a tenfold voltage increase is +20 dB.