Frequency prescaler method and apparatus responsive to low input

Details Frequency prescaler method and apparatus responsive to low input Frequency prescaler method and apparatus responsive to low input

1998-03-05

1999-08-17

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327115, 327117, 327156, H03L 706

Patent

active

059399112

ABSTRACT:
A low input prescaler (800) that is responsive to input signals having low amplitude alternating current (AC) components includes a switched tunable prescaler (280) that generates a prescaler output signal (221) having a prescaler output frequency during an operational state of the prescaler and having a free-running frequency that is responsive to a tuning control signal (216) during a tuning state of the prescaler. A frequency comparator (235) generates a comparator output in response to a difference between a reference frequency and the prescaler output frequency. A prescaler tuner (290, 390) adjusts the tuning control signal in response to the comparator output during the tuning state to minimize the difference between the reference frequency and the prescaler output frequency, and holds the tuning control signal during the operational state. The prescaler is used in phase lock loops (200, 400, 600) and other circuits.

REFERENCES:
patent: 4368540 (1983-01-01), Carlson et al.
patent: 4823123 (1989-04-01), Siwiak
patent: 4953187 (1990-08-01), Herold et al.
patent: 5802463 (1998-09-01), Zuckerman

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