公开(公告)号：US07277518B2

公开(公告)日：2007-10-02

申请号：US10717778

申请日：2003-11-20

申请人： Alvin Leng Sun Loke ,  James Oliver Barnes ,  Robert Keith Barnes ,  Michael M. Oshima ,  Ronald Ray Kennedy ,  Charles E. Moore

发明人： Alvin Leng Sun Loke ,  James Oliver Barnes ,  Robert Keith Barnes ,  Michael M. Oshima ,  Ronald Ray Kennedy ,  Charles E. Moore

IPC分类号： H03D3/24

CPC分类号： H03L7/0893 ,  H03L7/099 ,  H03L7/18 ,  H03L2207/06

摘要： A phase-locked loop includes a voltage-controlled oscillator and a charge-pump loop filter. The voltage-controlled oscillator includes a varactor having a first set of capacitor cells configured to adjust a capacitance based on a first control voltage, and a second set of capacitor cells configured to adjust a capacitance based on a second control voltage. The charge-pump loop filter receives a first and a second update signal, each having at least one state based on a phase difference between a first clock and a second clock, and comprises a first component and a second component. The first component is configured to adjust, during an update period, a voltage across an impedance from a reference level based on the states of the first and second update signals and to return the voltage across the impedance to the reference level prior to an end of the update period, wherein the voltage across the impedance comprises the first control voltage. The second component is configured to adjust a voltage across a capacitor based on the states of the first and second input signals, wherein the voltage across the capacitor comprises the second control voltage.

摘要翻译： 锁相环包括压控振荡器和电荷泵环路滤波器。 压控振荡器包括变容二极管，其具有被配置为基于第一控制电压来调整电容的第一组电容器单元和被配置为基于第二控制电压来调整电容的第二组电容器单元。 电荷泵环路滤波器接收第一和第二更新信号，每个信号具有基于第一时钟和第二时钟之间的相位差的至少一个状态，并且包括第一分量和第二分量。 第一组件被配置为在更新周期期间基于第一和第二更新信号的状态来调整来自参考电平的阻抗上的电压，并且在结束前将阻抗上的电压返回到参考电平 所述更新周期，其中所述阻抗两端的电压包括所述第一控制电压。 第二部件被配置为基于第一和第二输入信号的状态来调整电容器两端的电压，其中电容器两端的电压包括第二控制电压。