Apparatus to decrease the spurs level in a phase-locked loop
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United States of America Patent
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N/A
Issued Date -
Feb 27, 2003
app pub date -
Jul 26, 2002
filing date -
Jul 27, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A charge pump is disclosed including an output capacitive element to store an output voltage, a charging current source to charge the output capacitive element, a charging switching element to couple a first bias voltage to the charging current source in response to a charging signal, a discharging current source to discharge the output capacitive element, a discharging switching element to couple a second bias voltage to the discharging current source in response to a discharging signal, a unity gain amplifier to generate an amplifier voltage substantially equal to the output voltage, a first switching element to couple the amplifier voltage to the charging current source in response to a leakage prevention signal; and a second switching element to couple the amplifier voltage to the discharging current source in response to the leakage prevention signal.
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