Phase-locked loop having sampling phase detector
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United States of America
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Aug 22, 2017
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app pub date -
Jun 1, 2016
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Jun 1, 2016
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Abstract
An example a phase-locked loop (PLL) circuit includes a sampling phase detector configured to receive a reference clock and a feedback clock and configured to supply a first control current and a pulse signal. The PLL further includes a charge pump configured to generate a second control current based on the first control current and the pulse signal. The PLL further includes a loop filter configured to filter the second control current and generate an oscillator control voltage. The PLL further includes a voltage controlled oscillator (VCO) configured to generate an output clock based on the oscillator control voltage. The PLL further includes a frequency divider configured to generate the reference clock from the output clock.
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