The notch filter test method simulation for the intermodulation noise of return path CATV amplifiers

Author

Germanov, Vitaly

Author_Institution

Commun. Distribution Syst. GmbH, Munich, Germany

Volume

46

Issue

1

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

88

Lastpage

91

Abstract

CATV return path is mainly carrying QAM signals. The frequency spectrum of QAM digital signals is noise-like. This means, that a return path amplifier is loaded with wideband noise, and intermodulation products will be noise-like too. This article describes the numerical simulations of the notch filter test method for intermodulation noise distortion in return path CATV amplifiers. The calculation is based on the frequency dependent intermodulations coefficients of the second and third order as well as clipping effect. It is possible to calculate the return path distortion spectrum and the output level limit for any channel plan. The simulation proved to be in good accord with measurement

Keywords

cable television; community antenna television; intermodulation distortion; noise; notch filters; numerical analysis; quadrature amplitude modulation; video amplifiers; QAM digital signals; QAM signals; channel plan; clipping effect; frequency dependent intermodulations coefficients; frequency spectrum; intermodulation noise distortion; intermodulation products; measurement; notch filter test method simulation; numerical simulations; output level limit; return path CATV amplifiers; return path amplifier; return path distortion spectrum; wideband noise; Bandwidth; Broadband amplifiers; Distortion measurement; Filters; Frequency; Intermodulation distortion; Nonlinear distortion; Optical amplifiers; Optical noise; System testing;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/11.845869

Filename

845869