PLL FREQUENCY SYNTHESIZER
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United States of America Patent
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Issued Date -
Mar 4, 2010
app pub date -
Feb 8, 2008
filing date -
Mar 7, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A PLL frequency synthesizer 1 according to one embodiment of the present invention is provided with a frequency divider 30, a phase comparator 40, a charge pump 50, a loop filter 60, a voltage controlled oscillator 70, and a changeover switch (within the switching unit 80). The loop filter 60 has a reference potential on a semiconductor substrate as a ground potential, and the changeover switch is formed on the semiconductor substrate 2 and switches connection between an intermediate node of the loop filter 60 and the reference potential on the semiconductor substrate 2 to switch the time constant of the loop filter 60.
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