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发明公开
CN110417405A 具有降低的VCO增益的锁相环设计 有权

具有降低的VCO增益的锁相环设计
摘要：
一种PLL包括接收输入信号和反馈信号并且产生控制信号的相位频率检测器(PFD)。电荷泵接收控制信号并且产生初始VCO控制。环路滤波器基于初始VCO控制生成精细VCO控制和中间输出。粗略控制电路包括：积分器，该积分器具有接收中间输出的第一输入、第二输入，并且生成粗略VCO控制；将参考电压耦合到第二输入的第一开关；对积分器的输出进行缓冲的缓冲器；以及将积分器的输出耦合到积分器的第二输入的第二开关。VCO接收精细VCO控制和粗略VCO控制，并且生成具有基于精细VCO控制和粗略VCO控制的频率的输出信号。反馈路径接收输出信号并且产生反馈信号。
摘要（英）：

A PLL includes a phase frequency detector (PFD) receiving an input signal and feedback signal, and producing a control signal. A charge pump receives the control signal and produces an initial VCO control. A loop filter generates a fine VCO control and intermediate output based upon the initial VCO control. A coarse control circuit includes an integrator having a first input receiving the intermediate output, a second input, and generating a coarse VCO control, a first switch coupling a reference voltage to the second input, a buffer buffering output of the integrator, and a second switch coupling output of the integrator to the second input of the integrator. A VCO receives the fine VCO control and the coarse VCO control, and generates an output signal having a frequency based thereupon.A feedback path receives the output signal and produces the feedback signal.

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