Phase lock loop having a lock acquisition mode and method of ope

Details Phase lock loop having a lock acquisition mode and method of ope Phase lock loop having a lock acquisition mode and method of ope

1993-06-25

1995-04-18

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 25, H03L 7093, H03L 7107

Patent

active

054082021

ABSTRACT:
A phase lock loop comprises a phase detector (11), a frequency adjuster (13, 15) for adjusting and cancelling phase differences detected by said phase detector (11) and responsive thereto, and a filter (12) coupled between said phase comparator (11) and said frequency adjuster (13, 15). The phase lock loop has a first and a second operating mode (FIG. 5). Operation in said first operating mode is used to establish an initial lock acquisition to a desired output signal f.sub.out and uses a relatively wide bandwidth within the filter (12). At a transition from said first operating mode to said second operating mode, initial lock acquisition is lost, whereafter said second operating mode is used to re-establish final lock acquisition to the desired output frequency f.sub.out. A gain adjuster (15) commences the controlled adjustment of the gain of said phase comparator (11) at a transition between said first and said second operating modes. Moreover, said gain adjuster (15) adjusts the gain of said phase detection means (11) in a gradual manner defined by a decreasing function whereby the bandwidth of the filter (12) is controllably reduced to substantially that of a relatively narrow bandwidth at a time after lock acquisition has been re-established.

REFERENCES:
patent: 3566088 (1971-02-01), Crook
patent: 5151665 (1992-09-01), Wentzler
patent: 5153530 (1992-10-01), Takagi et al.
patent: 5162762 (1992-11-01), Flanagan
patent: 5164685 (1992-11-01), Niemio
patent: 5173665 (1992-12-01), Norimatsu
patent: 5233314 (1993-08-01), McDermott et al.

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