Fast locking phase locked loop frequency synthesizer

Details Fast locking phase locked loop frequency synthesizer Fast locking phase locked loop frequency synthesizer

1993-02-25

1995-01-24

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 18, 331 25, 455260, H03L 7089, H03L 7093, H03L 7107, H03L 718

Patent

active

053845510

ABSTRACT:
A radio apparatus with a phase locked loop is disclosed. The apparatus contains a phase detector with first and second inputs, where the first input receiving a reference frequency signal and the second input receives a controllable frequency signal that is controlled by a tuning voltage. Also included is, a loop filter for filtering the output of the phase detector, circuitry for decoding when a phase difference at the inputs of the phase detector exceeds a predetermined value, and a filter bypass circuit. This circuit bypasses operation of the loop filter when the difference at the inputs of the phase detector exceeds a predetermined value, allowing fast voltage changes of the tuning voltage, and providing a short lock time for the phase locked loop.

REFERENCES:
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patent: 5014316 (1991-05-01), Marrah et al.
patent: 5166644 (1992-11-01), Saito et al.
patent: 5180993 (1993-01-01), Dent
patent: 5194828 (1993-03-01), Kato et al.
patent: 5220294 (1993-06-01), Ichikawa

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