PM and AM noise of combined signal sources

Author

Walls, Fred L.

fYear

2003

fDate

4-8 May 2003

Firstpage

532

Lastpage

540

Abstract

The purpose of this paper is to establish a simple analytically model for computing the PM and AM noise of a signal obtained by combining the output of N, nominally independent, sources that takes into account different levels of noise and signal amplitude. Under ideal conditions, the noise of the combined signal is 1/N of the average source. This model shows that phase deviations between the combined signal and the individual sources leads to cross coupling between PM and AM noise. We find no plausible evidence for an intrinsic dependence of the noise reduction on spectral noise type in linear systems. This analysis assumes that environmental induced AM and PM noise are less than 1/3N below the noise in the individual sources and hence can be ignored.

Keywords

amplitude modulation; linear systems; oscillators; phase locked loops; phase modulation; phase noise; signal sources; AM noise; PM noise; amplitude modulation noise; analytical model; combined signal sources; cross coupling; linear systems; noise amplitude; noise reduction; phase deviations; phase modulation noise; signal amplitude; spectral noise; Bandwidth; Fluctuations; Frequency measurement; Noise level; Noise reduction; Phase locked loops; Phase measurement; Phase noise; Signal to noise ratio; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 IEEE International

ISSN

1075-6787

Print_ISBN

0-7803-7688-9

Type

conf

DOI

10.1109/FREQ.2003.1275148

Filename

1275148