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    FRACTIONAL-N FREQUENCY SYNTHESIZER HAVING REDUCED FRACTIONAL SWITCHING NOISE
    1.
    发明申请
    FRACTIONAL-N FREQUENCY SYNTHESIZER HAVING REDUCED FRACTIONAL SWITCHING NOISE 审中-公开
    具有减少分段开关噪音的零频合成器

    公开(公告)号：WO2010117466A1

    公开(公告)日：2010-10-14

    申请号：PCT/US2010/001066

    申请日：2010-04-09

    Applicant: HITTITE MICROWAVE CORPORATION ,  CLOUTIER, Mark, M. ,  SHEIKH, Kashif

    Inventor： CLOUTIER, Mark, M. ,  SHEIKH, Kashif

    IPC: H03L1/00

    CPC classification number: H03L7/1974

    Abstract: A fractional-N frequency synthesizer having reduced fractional switching noise and spurious signals is provided. The synthesizer includes a voltage controlled oscillator for providing an output signal. A fractional-N divider is responsive to the voltage controlled oscillator for providing a divided output signal having fractional switching noise. A band pass filter is responsive to the fractional-N divider for reducing the fractional switching noise and non-linearities that result in spurious signals. A phase detector is responsive to a reference signal and the band pass filter for providing a control signal representative of the phase difference between the reference signal and the signal from the band pass filter. A loop filter is responsive to the phase detector for filtering the control signal to control the voltage controlled oscillator, the output of the loop filter having reduced fractional switching noise and spurious signals.

    Abstract translation: 提供了具有降低的分数开关噪声和杂散信号的分数N频率合成器。 合成器包括用于提供输出信号的压控振荡器。 分数N分频器响应于压控振荡器，以提供具有分数开关噪声的分频输出信号。 带通滤波器响应分数N分频器，用于降低导致杂散信号的分数开关噪声和非线性。 相位检测器响应于参考信号和带通滤波器，用于提供表示参考信号和来自带通滤波器的信号之间的相位差的控制信号。 环路滤波器响应于相位检测器，用于对控制信号进行滤波以控制压控振荡器，环路滤波器的输出具有降低的分数开关噪声和杂散信号。

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