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    • 73. 发明申请
    • Synthesizer
    • 合成器
    • US20050012528A1
    • 2005-01-20
    • US10889122
    • 2004-07-13
    • Hiroshi Kodama
    • Hiroshi Kodama
    • H03B21/00H03L7/18H04B1/26H04L7/00H04L27/38
    • H03L7/18
    • A synthesizer that has a phase detector 8 and a charge pump circuit 9 for injecting an electric charge, or pulling it out that corresponded to a frequency difference of an input, a low-pass filter 11 for converting this electric charge into a voltage, a voltage control oscillator (VCO) 13 for changing an output frequency for this input voltage, a divider 14 for dividing the frequency of the input, and a voltage holding circuit 10 for holding the input voltage for a plurality of output frequencies of the VCO. A holding voltage of the voltage holding circuit 10 is switched with a switch 12, and the frequency of an output clock signal 3 is switched.
    • 具有相位检测器8和电荷泵电路9的合成器,用于将用于将该电荷转换为电压的低通滤波器11注入电荷或将其输出对应于输入的频率差, 用于改变该输入电压的输出频率的压控振荡器(VCO)13,用于分频输入频率的分频器14以及用于保持VCO的多个输出频率的输入电压的电压保持电路10。 电压保持电路10的保持电压用开关12切换,输出时钟信号3的频率被切换。