Frequency synthesizer

专利名称：Frequency synthesizer

发明人：Shouhei Kousai,Hiroyuki Kobayashi申请号：US11304594申请日：20051216公开号：US07317363B2公开日：20080108

专利附图：

摘要：There is provided a phase locked loop circuit which receives a reference signalhaving a reference frequency and a first signal having a first frequency, compares phasesof the reference signal and first signal, applies a control voltage based on a phasecomparison result to an input terminal of a voltage controlled oscillator to generate a

second signal having an oscillation frequency and output the second signal from anoutput terminal, and supplies the second signal to a divider to divide the frequency of thesecond signal and output the first signal; and a controller which generates and supplies acontrol signal to the voltage controlled oscillator, wherein the voltage controlledoscillator has an arrangement in which a coil and variable capacitance are connected inparallel between the input terminal and output terminal, and one of a plurality ofcapacitances is selectively connected between the input terminal and output terminal bya switch in parallel with the variable capacitance, and ON/OFF of the switch is controlledby the control signal.

申请人：Shouhei Kousai,Hiroyuki Kobayashi

地址：Kawasaki JP,Kawasaki JP

国籍：JP,JP

代理机构：Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

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