Method and apparatus for extending an operating frequency range

Details Method and apparatus for extending an operating frequency range Method and apparatus for extending an operating frequency range

1996-03-04

1998-08-11

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375324, 375376, 331 25, H03D 324, H04L 2714, H03L 700

Patent

active

057938253

ABSTRACT:
A method is used by a detector (102) for extending the operating frequency range of a phase lock loop (100). The detector (102) detects a phase-frequency difference between a reference signal (109) and a generated signal (108) of the phase lock loop (100). The detector (102) includes a divider (202) for counting transitions of the generated signal (108) and a logic element (204) and counter (212) for detecting when the frequency of the generated signal (108) is such that the divider (202) operates outside its linear frequency range in relation to a predetermined transition of the reference signal (109). The detector (102) further includes a register (206) for recording a phase value of the divider (202) coincident with the predetermined transition, or a constant phase value (304, 306) when the frequency of the generated signal (108) is operating outside of the linear range of the divider (202).

REFERENCES:
patent: 4167711 (1979-09-01), Smoot
patent: 4916403 (1990-04-01), Sudoh et al.
patent: 5128632 (1992-07-01), Erhart et al.
patent: 5552750 (1996-09-01), Barrett, Jr. et al.
patent: 5610558 (1997-03-01), Mittel et al.

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