Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1993-12-13
1996-04-09
Chin, Stephen
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
375376, 455260, 327 39, 327150, 327159, 331 34, H03D 324
Patent
active
055068758
ABSTRACT:
A method and apparatus for performing frequency acquisition. Frequency acquisition is accomplished by utilizing binary-search techniques with a controller (13), variable digital oscillator (16), frequency detector (11) an incrementor (19) and decrementor (21) and control registers (22). The frequency detector (11) generates an output indicating the relative speed of the variable oscillator (16) with reference to a externally provided signal. Depending on the output of the frequency detector (11 ), the arithmetic logic circuitry (19, 21) will increase or decrease the value in a control register (22), resulting in a corresponding increase or decrease in speed of the variable oscillator (16). The magnitude of changes to the control register (22) is gradually reduced as the steps of frequency detection and arithmetic updates are repeated until the variable oscillator (16) has reached the proper frequency.
REFERENCES:
patent: 4577163 (1986-03-01), Culp
patent: 4795985 (1989-01-01), Gailbreath, Jr.
patent: 5109394 (1992-04-01), Hjerpe et al.
Garcia Gerald W.
Lundberg James R.
Nuckolls Charles E.
Chin Stephen
Motorola Inc.
Phan Hai H.
Whitaker Charlotte B.
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