DBc

DBc

dBc (decibels relative to the carrier) is the power ratio of a signal to a carrier signal, expresses in decibels. 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 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 usually negative.

Although the decibel (dB) is permitted for use alongside SI units, the dBc is not. [ [http://physics.nist.gov/Pubs/pdf.html Taylor 1995, Guide for the Use of the International System of Units (SI), NIST Special Publication SP811] ]

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