Phase-locked loop with clamped voltage-controlled oscillator

Details Phase-locked loop with clamped voltage-controlled oscillator Phase-locked loop with clamped voltage-controlled oscillator

1990-04-05

1991-12-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 1A, 331 11, 331 25, 331 27, 307516, 328133, H03L 7093, H03L 723

Patent

active

050721950

ABSTRACT:
A phase-locked loop responsive to both phase and frequency difference between the incoming signal and the feedback signal is provided. Using a reference signal, this phase-locked loop accepts a wide range of frequencies similar to a phase-locked loop having a phase frequency detector, and also achieves the noise performance of a phase-locked loop having only a simple phase detector. In one embodiment, the phase-locked loop is a combination including first and second phase-locked loops. The reference signal is provided to the first phase-locked loop, which includes a phase frequency detector. This first phase-locked loop is used to control a second phase-locked loop, which includes a phase detector. A voltage clamp can also be provided to enhance the ability to lock a signal among several signals, or from a noisy background.

REFERENCES:
patent: 4131861 (1978-12-01), Malaviya
patent: 4516084 (1985-05-01), Crowley
patent: 4567448 (1986-01-01), Ikeda
Motorola MECL data book, copyrighted 1983, pp. 7-25 to 7-29.

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