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 eye opening

Required number input.

Measured eye opening

Required number input.

Express horizontal or vertical eye-opening loss as an equivalent amplitude penalty in decibels using matching eye-opening measurements. 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]

Eye-opening penalty (dB)

The resulting eye-opening penalty returned as a number.

• Signal-integrity estimates depend on edge rate, channel loss, impedance discontinuities, termination, encoding, equalization, clock recovery, jitter decomposition, crosstalk, connectors, vias, and receiver masks. Aggregate budgets must use compatible statistical or worst-case conventions.
• 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.

• De Emphasis Db

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

• Eye Height Estimate

  Find the vertical eye opening at the sampling instant as the minimum high level minus the maximum low level; a negative value means overlapping level distributions.

• Eye Width Estimate

  Find the horizontal eye opening between the latest left crossing and earliest right crossing in one unit interval.