Synchronization circuit using a high speed digital slip counter

Details Synchronization circuit using a high speed digital slip counter Synchronization circuit using a high speed digital slip counter

1993-09-30

1996-01-09

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, 331 44, H03L 700

Patent

active

054832012

ABSTRACT:
Simplifying measurement equipment so that any two frequency sources can be accurately and quantitatively compared to each other. With this simplified measurement equipment, calibration can be performed on an oscillator using an external reference signal, while the oscillator is being used in an active system. By simplifying the measurement equipment, the equipment can be built into a time base unit allowing recalibration to be performed at relatively short time intervals. A frequency difference detector based on ring counters and an existing controller in a telecommunication switching system compare an accurate external reference against an oscillator of the time base unit for calibration in the field. Within the telecommunication switching system, a highly accurate external reference signal is normally available from an interconnected telecommunication network. The use of ring counters in the frequency difference detector allows for simple measurement equipment which adds little to the cost of the time base unit. Further, since measurement equipment is all digital, no tuning of the equipment is necessary as is required of measurement equipment having analog components.

REFERENCES:
patent: 3806826 (1974-04-01), Schlosser
patent: 4498059 (1985-02-01), Edwards et al.
patent: 4516250 (1985-05-01), Grimes
patent: 4516861 (1985-05-01), Frew et al.
patent: 4780896 (1988-10-01), Dotter, Jr.
patent: 5023572 (1991-06-01), Caldwell et al.
patent: 5045813 (1991-09-01), Yamashita et al.
Research Disclosure, Automatic Detection of Oscillator Frequency Drift, No. 344, Dec. 1992, Havant GB, p. 964.

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