Phase lock loop with selectable frequency switching time

Details Phase lock loop with selectable frequency switching time Phase lock loop with selectable frequency switching time

1994-03-16

1995-05-30

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 16, 331 18, 331 25, 455260, H03L 7107, H03L 718

Patent

active

054205450

ABSTRACT:
A phase lock loop (PLL) circuit for controlling an oscillator includes a phase comparator, a loop filter, a reference converter and a feedback converter whose performance characteristics are dynamically controlled so as to provide a phase-locked output signal with both high frequency stepping resolution and low phase locking time. The phase comparator compares the relative phases of the reference and feedback signals, and outputs a phase difference signal representing such phase comparison. The loop filter, in accordance with a filter bandwidth dynamically selected by a filter control signal, filters the phase difference signal to provide a frequency control signal for a voltage controlled oscillator (VCO). The reference converter is a programmable frequency divider which, in accordance with a reference proportionality factor dynamically selected by a reference control signal, reduces the frequency of the PLL reference signal frequency used by the phase comparator. The feedback converter is another programmable frequency divider which, in accordance with a feedback proportionality factor dynamically determined by a feedback control signal, reduces the frequency of the VCO feedback signal frequency used by the phase comparator. Each combination of a selected filter bandwidth, a reference proportionality factor and a feedback proportionality factor corresponds to a different time interval within which phase lock is achieved.

REFERENCES:
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patent: 5146187 (1992-09-01), Vandegraaf
patent: 5276408 (1994-01-01), Norimatsu
patent: 5307071 (1994-04-01), Arnold et al.
patent: 5339050 (1994-08-01), Llewellyn
Eitan Sharoni, "Digital Control Speeds Synthesizer Switching", Microwaves & RF, Apr. 1987, pp. 107, 108, 110 and 112.

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