Differential PLL with charge pump chopping
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United States of America Patent
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Nov 27, 2018
Grant Date -
Jul 5, 2018
app pub date -
Aug 22, 2017
filing date -
Dec 30, 2016
priority date (Note) -
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Abstract
According to a first example aspect there is provided a charge pump circuit that includes a first chopper circuit configured to switch first and second chopper circuit outputs between first and second chopper circuit inputs at a chopping frequency, wherein successive input signals at the first chopper circuit input are output alternatively at the first and second chopper circuit outputs in successive cycles of the chopping frequency and successive input signals at the second chopper circuit input are output alternatively at the second and first chopper circuit outputs in successive cycles of the chopping frequency. A differential charge pump is configured to receive the signals output from the first and second chopper circuit outputs and produce corresponding first and second charge pumped signals.
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