Extended range phaselocked loop

Details Extended range phaselocked loop Extended range phaselocked loop

1987-02-19

1988-03-22

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 20, 358158, H03L 700

Patent

active

047331976

ABSTRACT:
An acquisition circuit in an improved phaselocked loop prevents cycle slipping by detecting and compensating an impending large phase difference between an independent incoming signal and a local comparison signal dependently related to a voltage controlled oscillator. A train of pulses is generated in progressively delayed phase relation with each cycle of the oscillator output signal. Additionally a threshold signal related to the independent signal is produced. In response to overlap of the threshold signal and individual ones of the pulses, a phase error signal is generated which controls a commutator to select individual ones of the pulses having a predetermined delay as the comparison signal, thereby generating a correcting control signal to phaselock the oscillator at a faster rate than the linear response time of a standard loop.

REFERENCES:
patent: 4600895 (1986-07-01), Landsman
patent: 4649438 (1987-03-01), Shimizu et al.
Oberst, "Generalized Phase Comparators for Improved Phase-Locked Loop Acquisition", IEEE Trans. on Com. Tech., vol. Com-19, No. 6, Dec. 1961, pp. 1142-1148.

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