Re: frequncy offset
Hi m229,
You have a signal, ideally a pure sinusoid (carrier).
Phase noise produces a quadrature component that cannot be removed by a limiter. This noisy component has a power spectral density (psd) that depends of frequency offset relative to the carrier. Integrating that psd over a given bandwidth gives a power.
In your example, if you measure the power in a bandwidth of 1Hz centered at a frequency 10 KHz apart the carrier, you obtain a power 100 dB below the carrier power. (The “c” in dBc stands for “carrier”.) If the bandwidth is 2 Hz, the power is 97 dB below the carrier power; if the bandwidth is 10 Hz, the power is 90 dB below the carrier power, and so on (if the bandwidth is narrow enough that the psd is constant in that band). At a different frequency offset the psd is in general different.
Is it clear?
Z