Phase-locked loop with initialization loop

Details Phase-locked loop with initialization loop Phase-locked loop with initialization loop

1980-10-31

1982-12-21

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

307517, 329 50, 329122, 331 14, 331 25, H03L 710

Patent

active

043652115

ABSTRACT:
An integrator and a voltage controlled oscillator produce a variable frequency output signal. A primary loop is locked to an input signal and has a narrow bandwidth allowing the output signal to precisely track the input signal. An initialization loop is locked to an internally generated reference signal and has a wide bandwidth for pulling the frequency of the output signal very close to the frequency of the reference signal. Since the frequency of the reference signal is approximately equal to the frequency of the input signal the initialization loop pulls the frequency of the output signal very close to the frequency of the input signal thus assuring locking of the primary loop. A switch selectively connects components of the primary loop to the integrator when the frequency difference between the reference signal and the output signal is small and connects components of the initialization loop to the integrator when the frequency difference between the reference signal and the output signal is large.

REFERENCES:
patent: 3241084 (1966-03-01), Klingberg
patent: 3447084 (1969-05-01), Haner et al.
patent: 3660781 (1972-05-01), Tewksbury et al.
patent: 3716802 (1973-02-01), Muratani et al.
patent: 3909735 (1975-09-01), Anderson et al.
patent: 4069462 (1978-01-01), Dunn
patent: 4117420 (1978-09-01), DeConinck et al.
patent: 4125815 (1978-11-01), Kirschner
patent: 4135166 (1979-01-01), Marchetti
patent: 4205277 (1980-05-01), Poinas

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