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    • 17. 发明授权
    • Differential charge pump based phase locked loop or delay locked loop
    • 基于差分电荷泵的锁相环或延迟锁定环
    • US6011822A
    • 2000-01-04
    • US843936
    • 1997-04-17
    • Stephen F. Dreyer
    • Stephen F. Dreyer
    • H03K3/0231H03K3/03H03L7/081H03L7/089H03L7/099H03D3/24
    • H03L7/0896H03K3/0231H03K3/03H03K3/0322H03L7/0812H03L7/0893H03L7/0995H03L2207/06
    • A phase locked loop includes a differential charge pump to cancel static phase error and reduce sensitivity to noise. The differential charge pump comprises two substantially identical single-ended charge pumps so that under locked condition, changes in voltage at the charge pumps' output terminals are substantially identical, thereby maintaining a substantially constant difference between the charge pumps' output voltage. A differential input voltage-controlled oscillator receives the output of the differential charge pump and generates a clock signal with a frequency proportional to the voltage difference output by the differential charge pump. A common mode bias circuit adjusts the common mode voltage output by the differential charge pump to optimize the voltage swing available at the differential charge pump's output terminals. The structure can be easily modified to implement a delay locked loop by replacing the differential input voltage-controlled oscillator with a differential input voltage-controlled delay circuit.
    • 锁相环包括一个差分电荷泵,以消除静态相位误差并降低对噪声的灵敏度。 差分电荷泵包括两个基本上相同的单端电荷泵,使得在锁定状态下,电荷泵的输出端子处的电压变化基本相同,从而在电荷泵的输出电压之间保持基本恒定的差。 差分输入压控振荡器接收差分电荷泵的输出,并产生与差分电荷泵输出的电压差成比例的频率的时钟信号。 共模偏置电路调节由差分电荷泵输出的共模电压,以优化差分电荷泵输出端可用的电压摆幅。 可以通过用差分输入电压控制延迟电路代替差分输入压控振荡器来轻松修改结构以实现延迟锁定环。