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.

RMS signal amplitude

Required number input.

RMS noise amplitude

Required number input.

Express a fingerprint sensor's measured RMS image-signal amplitude divided by RMS noise as voltage SNR 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]

Signal-to-noise ratio (dB)

The resulting signal-to-noise ratio 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.

• Ideal ADC SNR

  Estimate ideal full-scale sine-wave signal-to-quantization-noise ratio as 6.02N+1.76 dB. Oversampling, thermal noise, distortion, and reduced input amplitude are not included.

• De Emphasis Db

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