Phase locked loop with switchable filter

Details Phase locked loop with switchable filter Phase locked loop with switchable filter

1978-10-26

1980-05-27

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 331 25, 331DIG2, H03B 304

Patent

active

042052777

ABSTRACT:
Disclosed is a phase-locked loop which comprises a voltage controlled variable frequency oscillator (1), a phase comparator (2) having a cosine characteristic and receiving a reference oscillation as well as that supplied by the oscillator (1), and a low-pass filter (3) connected between the output of the phase comparator (2) and a frequency control input of the oscillator (1).
The transfer function of the low-pass filter (3) is switchable between two characteristics depending on the instantaneous phase difference between the reference oscillation and that supplied by the oscillator. The first low-pass filter transfer function is adapted to the phase-locked operation of the loop, while the second transfer function is adapted for frequency capture.

REFERENCES:
patent: 3909735 (1975-09-01), Anderson et al.
patent: 3983501 (1976-09-01), Lindstrum
patent: 4034310 (1977-07-01), Coe
Hiroshige, IEEE Transactions on Space Electronics and Telemetry, vol. SE1-11, Mar. 1965, pp. 40-46.
McGeehan, Proceedings of the IEEE, vol. 123, No. 8, Aug. 1976, pp. 761-764.

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