Precision control frequency synthesizer having an unstable, variable frequency input signal
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United States of America Patent
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Jul 9, 1985
Grant Date -
N/A
app pub date -
Feb 9, 1984
filing date -
Feb 9, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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