Digital phase-locked loop with fast output frequency digital control
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United States of America Patent
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Oct 17, 2023
Grant Date -
Aug 25, 2022
app pub date -
Feb 23, 2022
filing date -
Feb 24, 2021
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Abstract
The present disclosure is directed to a digital phase-locked loop frequency synthesizer including: a digitally controlled voltage-controlled oscillator (DCO); a reference oscillator; a digital phase detector; a DCO control module comprising a plurality of registers each arranged to control the frequency of the signal with a predetermined resolution; a first feedback loop arranged to provide a first feedback path between the output of the DCO and the digital phase detector; and a second feedback loop arranged to provide a second feedback path between the first register output and the second register input, the second feedback loop comprising an adder module arranged to change a value of the second register based on the first register output to maximize a DCO frequency output range provided by the first register.
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