Spurious-Free Dynamic Range dynamic range free of spurious components is a dimensionless quantity equal to the ratio of the power of a useful narrow-band signal (carrier) to the power of the most powerful spurious frequency component (harmonic). It is used as one of the characteristics for measuring ADCs and DACs , as well as radio receivers .
SFDR is calculated as the ratio of the RMS of the harmonic at the carrier frequency (maximum in the signal spectrum) at the ADC input or the output of the DAC to the RMS of the next largest harmonic, which can be due to signal distortion, or to the maximum noise value (in the spectrum) if there is no distortion. Usually expressed in decibels . Depending on the measurement conditions, SFDR can be measured both in a given frequency band and in the entire available frequency band (from zero frequency to the Nyquist frequency ) of the converter.
See also
- Signal to noise ratio
Links
- 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 July 26, 2011