Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1989-06-29
1990-02-13
Laroche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
3581911, 455183, H03L 700
Patent
active
049010360
ABSTRACT:
A frequency synthesizer which has at least one programmably characterized phase lock loop circuit includes a buffer memory and an interface controller responsive to operational codes received from a central controller to direct transfer of data words for characterization of the phase lock loop circuit among the at least one phase lock loop circuit, the buffer memory, and the central controller. In one embodiment, the transfer of data words between the central controller and phase lock loop circuit or buffer memory are performed serially in accordance with a prespecified protocol and governed by a clock signal generated by the central controller. Data word transfers between the buffer memory and at least one phase lock loop circuit may also be performed serially in accordance with a prespecified protocol, but may be governed autonomously by an internal clock signal generated by the frequency synthesizer.
REFERENCES:
patent: 4326220 (1982-04-01), Mogi
patent: 4451850 (1984-05-01), Kamemoto
patent: 4476580 (1984-10-01), Tanaka et al.
patent: 4516170 (1985-05-01), Skerlos
Plessey Co. PFC, Specification for NJ88C31, Publication No. P.S. 2059, May 1986.
Davis Walter L.
Herold Barry W.
Rivas Mario A.
Tahernia Omid
Ingrassia Vincent B.
LaRoche Eugene R.
Motorola Inc.
Pascal Robert J.
Zitelli William E.
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