Fractional N synthesizer
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United States of America Patent
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-
Jul 19, 1988
Grant Date -
N/A
app pub date -
Nov 24, 1986
filing date -
Feb 21, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fractional N synthesizer comprising a voltage controlled oscillator for producing an output signal which is afforded to a phase detector via a variable divider to provide a control signal for the voltage controlled oscillator in the presence of a phase difference between a reference signal from a reference source and the signal afforded thereto from the variable divider wherein the synthesizer is provided with first and second accumulators, the arrangement of the accumulators being such that an output signal from the arrangement is provided in which the interpolation sidebands of the first accumulator caused by quantization errors in the first accumulator are cancelled, means being provided for setting the division ratio of the variable divider in dependence upon the output signal.
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