dBc
From Wikipedia, the free encyclopedia
dBc, decibels relative to the carrier, expresses in decibels the power ratio of a signal to a carrier signal. For example, phase noise is expressed in dBc/Hz at a given frequency offset from the carrier. dBc can also be used as a measurement of spurious free dynamic range (SFDR) between the desired signal and unwanted spurious outputs resulting from the use of a digital-to-analog converter or frequency mixer.
Since the signal in question is usually weaker than the carrier, dBc values are often negative.
Although the decibel (dB) is permitted for use alongside SI units, the dBc is not.[1]
