Phase locked loop having a charge pump with reset

Details Phase locked loop having a charge pump with reset Phase locked loop having a charge pump with reset

1991-01-24

1992-03-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

307516, 328133, 331 17, 331 27, H03L 7093

Patent

active

050952870

ABSTRACT:
The charge pump circuit of a phase locked loop has a sensing device, latch and charge pump. When there are contemporaneous up and down signals being produced by the charge pump, a reset signal is provided from the sensing device to a latch which is coupled between the input to the circuit and the pump. Input signals are then inhibited from reaching the charge pump.

REFERENCES:
patent: 3714463 (1973-01-01), Lanne
patent: 4814726 (1989-03-01), Byrd et al.
patent: 4857866 (1989-08-01), Tateichi

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