Spurious Free Dynamic Range

NI High-Speed Digitizers Help (NI-SCOPE)

Edition Date: January 2017

Part Number: 370592AB-01

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Spurious free dynamic range (SFDR) is the usable dynamic range before spurious noise interferes with or distorts the fundamental signal. The amplitude of the fundamental signal is usually -1 dBFS. SFDR is the measure of the ratio in amplitude between the fundamental signal and the largest harmonically or non-harmonically related spur from DC to the full Nyquist bandwidth (half the sampling rate). A spur is any frequency bin on a spectrum analyzer, or from a Fourier transform, of the analog signal. SFDR is expressed in dBc.

The following figure illustrates how SFDR is measured.


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