Dead-Zone Free Charge Pump Phase-Frequency Detector
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United States of America Patent
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Issued Date -
Apr 30, 2015
app pub date -
Oct 31, 2013
filing date -
Oct 31, 2013
priority date (Note) -
Abandoned
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Abstract
A charge-pump phase-frequency detector includes first and second flip-flops first and second delay circuits, a charge pump circuit and a reset gate. The flip-flops each have a respective data input connected to a fixed logic level, a reset input, a data output, and a clock input. The clock inputs of the first and second flip-flops are connected to receive a frequency reference signal and a feedback signal derived from the VCO, respectively. The reset gate includes a respective input connected to the data output of each of the flip-flops, and an output connected to the reset inputs of the flip-flops via the first delay circuit. The charge pump circuit includes an up input connected to the data output of the first flip-flop via the second delay circuit, a down input connected to the data output of the second flip-flop, and a control current output.
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