What is the difference between dB and dBc?
dBc = dB relative to the carrier. This is used e.g. to specify the power of a sideband in a modulated signal relative to the carrier. For example, −30 dBc means that the sideband is 30 dB below the carrier, i.e., it has a 1000 times lower power.
What unit is dBc?
dBc (decibels relative to the carrier) is the power ratio of a signal to a carrier signal, expressed in decibels. For example, phase noise is expressed in dBc/Hz at a given frequency offset from the carrier.
How do you convert to dB?
The dB is calculated via two different expressions XdB=10log10(XlinXref)orYdB=20log10(YlinYref). If you convert a quantity X that relates to power or energy, the factor is 10. If you convert a quantity Y that relates to amplitude, the factor is 20.