Method and apparatus for performing frequency tracking in an all

Details Method and apparatus for performing frequency tracking in an all Method and apparatus for performing frequency tracking in an all

1993-12-13

1995-01-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 25, 327159, H03L 7087

Patent

active

053811160

ABSTRACT:
An all digital phase lock loop (ADPLL), (10) includes a variable digital oscillator (DCO 16), a phase detector (12), a controller (13) including an incrementor (19) and decrementor (21), and a set of oscillator control registers (22). A frequency tracking circuit (20) is separated from the phase acquisition/maintenance logic circuitry. The frequency tracking circuitry (20) uses an anchor value to maintain and update a DCO control value corresponding to a target frequency of operation of the DCO (16). Updates to the anchor value are facilitated by monitoring recent history of an output control signal (ahead or behind) provided by the phase detector (12). The anchor value is changed to maintain the target frequency of operation of the DCO (16), even in the presence of variations in operating environments.

REFERENCES:
patent: 4577163 (1986-03-01), Culp
patent: 4795985 (1989-01-01), Gailbreath, Jr.
patent: 5122761 (1992-06-01), Wischermann

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