Determining phase linearity in CATV distribution systems

Details Determining phase linearity in CATV distribution systems Determining phase linearity in CATV distribution systems

2007-05-01

2007-05-01

Vu, Ngoc (Department: 2623)

Interactive video distribution systems

Video distribution system with upstream communication

Remote testing of cable system

C348S180000, C348S192000, C455S067160, C725S118000

Reexamination Certificate

active

10088127

ABSTRACT:
An apparatus for testing the phase linearity of a network comprises a first local oscillator, a first mixer, and a first filter, a second local oscillator, and a second mixer for mixing the first IF to the desired output frequency. The output of the second mixer is coupled to a second filter which passes the desired frequency band, but rejects the high frequency mixing harmonics produced in the second mixer. The output of the second filter is coupled to a variable gain amplifier capable of amplifying the frequency band of interest to the desired level and a third filter which further rejects unwanted high frequencies in the output.

REFERENCES:
patent: 5412694 (1995-05-01), Sato et al.
patent: 5453714 (1995-09-01), Madsen
patent: 5784413 (1998-07-01), Chen
patent: 5809089 (1998-09-01), Vasic
patent: 6239660 (2001-05-01), Dekker
patent: 6385267 (2002-05-01), Bowen et al.
patent: 6389087 (2002-05-01), Heinonen et al.

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