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    • 9. 发明授权
    • System and method for control parameter re-centering in a controlled phase lock loop system
    • 控制参数重心在控制锁相环系统中的系统和方法
    • US06882230B2
    • 2005-04-19
    • US10604095
    • 2003-06-26
    • Joseph A. IadanzaRam KelkarStephen D. Wyatt
    • Joseph A. IadanzaRam KelkarStephen D. Wyatt
    • H03L7/18H03L7/00
    • H03L7/18H03L2207/06
    • A re-centering system (116) for re-centering the control parameter of a phase lock loop (PLL) (112). The re-centering system includes sources (140) for obtaining/storing operating parameters, such as environmental data (184), setup data (188), and other knowns data (192). At least one state machine (132) utilizes the operating parameters to adjust the topology of the PLL so as to achieve a desirable topology for each target output frequency (18) that substantially centers the performance envelope(s) (120, 124, 128) to a desired pre-selected value of the control parameter. The re-centering system also includes a comparator (136) for comparing measured values of the control parameter to a pre-selected value. The state machine utilizes the output of the comparator to substantially center the corresponding performance envelope at the pre-selected value.
    • 一种用于重新定心锁相环(PLL)(112)的控制参数的重定心系统(116)。 再定心系统包括用于获取/存储诸如环境数据(184),建立数据(188)和其他已知数据(192)的操作参数的源(140)。 至少一个状态机(132)利用操作参数来调整PLL的拓扑结构,以便实现基本上使性能包络(120,124,128)中心的每个目标输出频率(18)的理想拓扑, 到控制参数的期望的预选值。 重新定心系统还包括比较器(136),用于将控制参数的测量值与预选值进行比较。 状态机利用比较器的输出使相应的性能包络大致居中在预先选定的值。
    • 10. 发明授权
    • High output resistance, wide swing charge pump
    • 高输出电阻,宽摆电荷泵
    • US07583116B2
    • 2009-09-01
    • US11833500
    • 2007-08-03
    • Stephen D. WyattTian Xia
    • Stephen D. WyattTian Xia
    • H03L7/06
    • H03L7/0896H02M3/07H03L7/18
    • Disclosed are current sink and source circuits, a charge pump that incorporates them, and a phase locked loop that incorporates the charge pump. The current sink and source circuits each have a current mirror that biases a transistor connected to an output node. These circuits each further have a two-stage feedback amplifier to sense the current mirror drain voltage and to control the transistor gate voltage in order to stabilize the current mirror drain voltage independent of output voltage at the output node. The amplifier also increases output resistance at the output node. This configuration allows for a wide operation voltage range and ensures good circuit performance under a very low power supply. A charge pump that incorporates these circuits generates highly matched charging and discharging currents. A PLL that incorporates this charge pump exhibits minimal bandwidth shifts and minimal locking speed and jitter performance degradation.
    • 公开了当前的电流源和源极电路,它们组合的电荷泵以及结合电荷泵的锁相环。 电流源和电源电路各自具有偏置连接到输出节点的晶体管的电流镜。 这些电路还具有两级反馈放大器以感测电流镜漏极电压并控制晶体管栅极电压,以便稳定电流镜漏极电压,而与输出节点处的输出电压无关。 放大器还增加输出节点的输出电阻。 该配置允许宽的工作电压范围,并在非常低的电源下确保良好的电路性能。 集成这些电路的电荷泵产生高度匹配的充电和放电电流。 集成该电荷泵的PLL具有最小的带宽偏移和最小的锁定速度和抖动性能下降。