Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1984-02-09
1985-07-09
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 16, 331 17, 331 25, 331 14, H03L 716
Patent
active
045285217
ABSTRACT:
The subject invention is a precision controlled frequency synthesizer which is capable of precisely adjusting the frequency of an output signal to maintain a desired frequency difference between an input and output signal regardless of the stability of the frequency of an input signal. The synthesizer comprises the basic elements of a phase locked loop (PLL) type circuit. The PLL circuit portion detects the actual frequency difference, a value A, between the input and output signals. A reference source provides a desired frequency difference, a value D, which represents the frequency difference between a stable input frequency and a desired output frequency. The difference between the frequency difference values A and D serves as the amount of adjustment to the frequency of the output signal. This adjustment represents the amount of compensation necessary to maintain a specified frequency relationship between the input and output signals.
REFERENCES:
patent: 3898690 (1975-08-01), Desai
patent: 4453136 (1984-06-01), Kelland
AT&T Information Systems Inc.
Duft D. M.
Grimm Siegfried H.
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