Spurious-free dynamic range
Spurious-free dynamic range (SFDR) is the strength ratio of the fundamental signal to the strongest spurious signal in the output. It is also defined as a measure used to specify analog-to-digital and digital-to-analog converters (ADCs and DACs, respectively) and radio receivers.
SFDR is defined as the ratio of the
carrier signal amplitude) or in dBFS (i.e. with respect to the ADC's full-scale range). Depending on the test condition, SFDR is observed within a pre-defined frequency window or from DC up to Nyquist frequency
of the converter (ADC or DAC).
[1]
In case of a radio receiver application, the definition is slightly different. The reference is the
RF
systems where output spurious signals are nonlinear function of input power, more precise measurement is required to take into account this non-linearity in power.
Where is the third-order intercept point and is the noise floor of the component, expressed in dB or dBm.
References
- ^ Walt Kester, MT-003: Understand SINAD, ENOB, SNR, THD, THD + N, and SFDR so You Don't Get Lost in the Noise Floor, Analog Devices, Retrieved 26 July 2011
- ISBN 9780471322825.
See also
- Analog-to-digital converter
- Digital-to-analog converter
- THD (Total Harmonic Distortion)
- SINAD (Signal-to-Noise-And-Distortion)
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