CHARGE PUMP, A PHASE LOCKED LOOP CIRCUIT AND A CHARGE PUMP METHOD
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United States of America Patent
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Issued Date -
Nov 13, 2014
app pub date -
Jun 8, 2013
filing date -
May 8, 2013
priority date (Note) -
Abandoned
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Abstract
The invention discloses a charge pump, a phase locked loop circuit and a charge pump method. The charge pump comprises an input port, a switch and an output port. The input port receives a phase frequency adjustment parameter. The switch switches a first current on or off, according to the phase frequency adjustment parameter, and keeps a second current on. The first current is larger than the second current. The output port outputs a sum of the first current and the second current to a low pass filter.
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