Phase

Understanding Phase noise of a Hard Limited Sine Wave

Understanding Phase noise of a Hard Limited Sine Wave
  1. How is phase noise calculated?
  2. What is meant by phase noise?
  3. How does phase noise change with frequency?

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 is meant by phase noise?

Phase noise is defined as the ratio of noise power at a given offset frequency to the carrier power. From: Principles and Applications of RF/Microwave in Healthcare and Biosensing, 2017.

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.

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