Spread spectrum clock generator

专利名称：Spread spectrum clock generator发明人：Satoshi Yoneda申请号：US11175342申请日：20050707公开号：US07620094B2公开日：20091117

专利附图：

摘要：Disclosed is a spread spectrum clock generator which includes: a first delaycontrol type oscillator that variably controls an oscillation period at a control periodinterval according to a control signal; a control circuit; a maximum modulation valuedetermination circuit that determines a maximum modulation value from a

predetermined value, a frequency control signal, and a given modulation degree settingsignal; a modulation signal generation circuit that receives the maximum modulationvalue from the maximum modulation value determination circuit and generates amodulation control signal within the maximum modulation value; and a second delaycontrol type oscillator that receives a value obtained by adding the modulation controlsignal from the modulation signal generation circuit to the frequency control signal as acontrol signal and variably controls the oscillation period of an output clock signal at thecontrol period interval according to the control signal. The control circuit outputs thefrequency control signal for variably controlling the oscillation period based on theresult of phase comparison between a clock signal obtained by frequency dividing theoutput of the first delay control type oscillator and a frequency divided clock signal of areference clock signal, performed by a phase comparator.

申请人：Satoshi Yoneda

地址：Kanagawa JP

国籍：JP

代理机构：McGinn IP Law Group, PLLC

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