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    Phase locked loop having a reduced lock time
    2.
    发明公开
    Phase locked loop having a reduced lock time 有权
    Phasenregelschleife mit verringerter Verriegelungszeit

    公开(公告)号：EP1182780A2

    公开(公告)日：2002-02-27

    申请号：EP01306946.3

    申请日：2001-08-15

    申请人： Tektronix, Inc.

    发明人： Sutton, Brian P.

    IPC分类号： H03L7/189

    CPC分类号： H03L7/189 ,  H03L2207/06

    摘要： A reduced lock time phase locked loop has a speed up circuit with an operational amplifier (24) to amplify a differential voltage across a filter resistor (R1) of an RC noise filter, the RC noise filter (R1,C) coupling a coarse tune voltage to a VCO (12). The amplified differential voltage is applied to the bases of a pair of opposite polarity transistors (Q1,Q2), the emitters of the transistors being coupled to a filter capacitor (C) in the RC noise filter for rapid charging/discharging.
    Alternatively the amplified differential voltage is applied to a pair of parallel, opposite polarity diodes (D1,D2) coupled to the filter capacitor for rapid charging/discharging.

    摘要翻译： 缩短的锁定时间锁相环具有与运算放大器（24）的加速电路，以放大RC噪声滤波器的滤波电阻器（R1）两端的差分电压，RC噪声滤波器（R1，C）将粗调 电压到VCO（12）。 放大的差分电压施加到一对相反极性晶体管（Q1，Q2）的基极，晶体管的发射极耦合到用于快速充电/放电的RC噪声滤波器中的滤波电容器（C）。 或者，放大的差分电压被施加到耦合到滤波电容器的一对并联的相反极性二极管（D1，D2），用于快速充电/放电。

    Phase locked loop having a reduced lock time
    3.
    发明公开
    Phase locked loop having a reduced lock time 有权
    具有降低锁定时间锁相环

    公开(公告)号：EP1182780A3

    公开(公告)日：2003-05-02

    申请号：EP01306946.3

    申请日：2001-08-15

    申请人： Tektronix, Inc.

    发明人： Sutton, Brian P.

    IPC分类号： H03L7/189

    CPC分类号： H03L7/189 ,  H03L2207/06

    摘要： A reduced lock time phase locked loop has a speed up circuit with an operational amplifier (24) to amplify a differential voltage across a filter resistor (R1) of an RC noise filter, the RC noise filter (R1,C) coupling a coarse tune voltage to a VCO (12). The amplified differential voltage is applied to the bases of a pair of opposite polarity transistors (Q1,Q2), the emitters of the transistors being coupled to a filter capacitor (C) in the RC noise filter for rapid charging/discharging. Alternatively the amplified differential voltage is applied to a pair of parallel, opposite polarity diodes (D1,D2) coupled to the filter capacitor for rapid charging/discharging.