Phase noise and frequency noise relationship

Phase noise is directly related to frequency noise, as the instantaneous frequency is essentially the temporal derivative of the phase. For example, white (frequency-independent) frequency noise corresponds to phase noise with S_φ(f) ≈ 1 / f².

1. How does phase noise change with frequency?
2. How does phase noise affect signal?
3. How is phase noise calculated?
4. What affects phase noise?

How does phase noise change with frequency?

The phase noise increases when a signal is frequency multiplied, +6 dB for every doubling. The phase noise decreases when a signal is frequency divided, -6 dB for every division by 2.

How does phase noise affect signal?

Phase noise is the noise produced by rapid, short-term fluctuations in a satellite signal. The fluctuations spread the power of a signal to adjacent frequencies, resulting in “noise sidebands.” Phase noise reduces signal quality and increases error rates in communication links.

How is phase noise calculated?

Phase noise measurements quantify the short term stability of a frequency source. That is because phase and frequency are mathematically related by a differential function [ω(t) = dΦ(t)/dt] so they are directly connected.

What affects phase noise?

Phase Noise is represented in the frequency domain of a waveform and consists of rapid, short-term, random fluctuations in the phase (frequency). This is caused by time domain instabilities (jitter).