Apparatus for cancelling carrier phase jitters

Details Apparatus for cancelling carrier phase jitters Apparatus for cancelling carrier phase jitters

1989-07-27

1992-07-07

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375118, 328155, 328162, H04L 2706

Patent

active

051289687

ABSTRACT:
A jitter cancelling apparatus cancels both low and high frequency jitter in a carrier signal. The jitter cancelling apparatus has both a phase-locked-loop for cancelling lower frequency jitter and a predictive jitter canceller for cancelling higher frequency jitter. The jitter cancelling apparatus also has a control circuit which contains a jitter frequency measuring circuit for measuring jitter frequency. The control circuit determines whether the jitter cancelling circuit or the phase locked-loop is effectively operative according to whether the jitter frequency is above or below a predetermined value.

REFERENCES:
patent: 4320526 (1982-03-01), Gitlin
patent: 4412299 (1983-10-01), Huffman
patent: 4447910 (1984-05-01), Smith et al.
patent: 4495468 (1985-01-01), Richards et al.
patent: 4514855 (1985-04-01), Lang et al.
patent: 4631738 (1986-12-01), Betts et al.
patent: 4683578 (1987-07-01), Betts et al.
patent: 4689804 (1987-08-01), Srinivasagopalan et al.
patent: 4792964 (1988-12-01), Yoshida
patent: 4856031 (1989-08-01), Yoshida

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