Importance

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Abstract

A frequency synthesizer of the fractional N type 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 division ratio of the variable divider is set in dependence upon the output of an interpolator arrangement comprising combiner means for receiving a digital input, digital controller means for receiving an output from the combiner means, digital slicer means for receiving an output from the digital controller means, feedback means for affording the output of the digital slicer means to a component for varying the division ratio of the variable divider.

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First Claim