Phase noise

Click here to go to our page on noise figure

Click here to watch some great videos on fundamentals of phase noise (new for November 2021)

Phase noise is "jitter" associated with the phase of a signal.  It is present in oscillators, and can be degraded by amplifiers, multipliers and mixers as a signal is processed. Low phase noise is required for many radar applications, as well as digital modulation schemes.

While we are waiting for content on this page, check out wikipedia's phase noise page. There are plenty of application notes from Keysight that you can find on the web.

Thick film resistors have high flicker noise compared to thin film, often 20-40 dB close in to the signal.  Here is an article that provides data on this phenomenon. Thanks to Kevin for bringing this to our attention!

Additive phase noise measurement is often performed with elaborate setups that compare a "clean" signal to the the signal you want to evaluate.

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Author : Unknown Editor