Charge pump circuit
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United States of America Patent
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Nov 12, 2013
Grant Date -
Nov 17, 2011
app pub date -
May 12, 2011
filing date -
May 12, 2010
priority date (Note) -
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Abstract
A charge pump circuit includes a switching circuit for providing a charge and discharge current, and a control circuit for controlling the switching circuit. The switching circuit includes a first switch for controlling the charging speed. The control circuit generates a signal for controlling the first switch based on the pulse width of the input signal. The charge pump circuit of the present invention quickens the locking time of the phase locked loop.
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