PLL Circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
May 13, 2010
app pub date -
Oct 29, 2009
filing date -
Nov 12, 2008
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A VCO/current switching circuit outputs a VCO selection signal for selecting one VCO out of two or more VCOs on the basis of the externally provided frequency division data. Moreover, when switching the VCOs, the VCO/current switching circuit outputs a switching signal for changing the output current of the variable charge pump to a larger value than normal (value when it is locked). After completing the switching of the VCOs, the VCO/current switching circuit outputs a switching signal for changing the output current of the variable charge pump to a normal small value.
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