Phase locked loop with reduced noise
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United States of America Patent
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Feb 13, 2018
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N/A
app pub date -
May 17, 2016
filing date -
May 20, 2015
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Abstract
A phase locked loop, comprising: a phase detector configured to determine a phase difference (Δφ) between a reference signal and a feedback signal; a loop filter configured to perform a filtering operation on a signal derived from the phase difference, and to provide a control signal; a frequency controlled oscillator configured to receive the control signal and provide an output signal with a frequency that varies according to the control signal; wherein a low-pass filter is provided between the phase detector and the loop filter and/or between the loop filter and the frequency controlled oscillator to reduce quantization noise from the phase detector.
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