Externally-synchronized voltage-controlled oscillator in phase l

Details Externally-synchronized voltage-controlled oscillator in phase l Externally-synchronized voltage-controlled oscillator in phase l

1997-10-15

2000-01-25

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 1A, 327144, 327147, 375376, H03L 706

Patent

active

060182733

ABSTRACT:
A phase locked loop is described which uses a first and second voltage-controlled oscillator. The first voltage-controlled oscillator is input into a feedback circuit which is used to produce a control signal. The control signal runs both the first and second voltage-controlled oscillators. A synchronization circuit is used to synchronize the first voltage-controlled oscillator with the synchronization pulse. In one embodiment, the synchronization circuit can use the second voltage-controlled oscillator to produce a timing interval to control the turning on and off of the second voltage-controlled oscillator in order to facilitate this synchronization. Because the output of the first voltage-controlled oscillator is sent to the feedback, the output of the phase locked loop will not drift due to parameter differences between the first and second voltage-controlled oscillators. In one embodiment, the second voltage-controlled oscillator is used to produce a single-cycle delay signal, which aids in the synchronization of the first voltage-controlled oscillator with the synchronization pulse.

REFERENCES:
patent: 4305045 (1981-12-01), Metz et al.
patent: 4675617 (1987-06-01), Martin
patent: 5237290 (1993-08-01), Banu et al.

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