Phase-locked loop with pulse-duration modulation fine frequency

Details Phase-locked loop with pulse-duration modulation fine frequency Phase-locked loop with pulse-duration modulation fine frequency

1990-06-20

1991-10-01

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 16, 331 17, 331 25, 331 36C, 331116R, 331179, H03L 7099, H03L 718

Patent

active

050537237

ABSTRACT:
A phase-locked loop includes an oscillator controlled by means of a switching network and a microprocessor which generates, in response to the output of a phase detector, two groups of output signals. A first group (Q1 . . . QN) is for adjusting the frequency of the oscillator in steps by selectively switching in frequency determining elements, and a second group (P1 . . . PM) for feeding a pulse duration modulator. The pulse duration modulator produces a control signal for a frequency determining minimum element of the switching network. The control signal has a duty cycle indicative of the frequency determination contribution by the minimum element.

REFERENCES:
patent: 4503401 (1985-03-01), Kyriakos et al.

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