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.

Spur Dbm (dBm)

Required number input.

Carrier Dbm (dBm)

Required number input.

Reference-spur level relative to carrier in dBc from measured spur and carrier powers in dBm. 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]

Spur Dbc (dBc)

The resulting spur dbc returned as a number.

• PLL bandwidth, margin, lock time, output frequency, spur, and integrated-jitter estimates depend on loop order, charge pump, divider values, oscillator gain, reference noise, nonlinear acquisition, and the exact phase-noise integration limits. Simplified linear models primarily describe locked small-signal behavior.
• 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.

• SFDR dB

  Compute the spurious-free dynamic range in decibels as the carrier level minus the largest spur level, both in dBm.

• ADC Spurious-Free Dynamic Range

  Compute SFDR in dBc as 20log₁₀(fundamental RMS amplitude/largest spur RMS amplitude), excluding DC. Use amplitudes measured in the same unit from one spectrum.

• Antenna Sidelobe Level

  Sidelobe level relative to the main-lobe peak from linear same-reference power measurements.