利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

2 条记录 (耗时 0.011 秒)

    VCO with high-Q switching capacitor bank
    1.
    发明授权
    VCO with high-Q switching capacitor bank 有权
    VCO具有高Q开关电容器组

    公开(公告)号：US06778022B1

    公开(公告)日：2004-08-17

    申请号：US10057707

    申请日：2002-01-24

    申请人： Pengfei Zhang ,  Chet Soorapanth

    发明人： Pengfei Zhang ,  Chet Soorapanth

    IPC分类号： H03L700

    CPC分类号： H03L7/18 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/124 ,  H03B2201/0266 ,  H03J2200/10 ,  H03L7/099

    摘要： Circuits and methods for tuning voltage-controlled oscillators. A control voltage is applied through an isolation resistor to a varactor. The varactor capacitance is AC coupled through a second capacitance. The control voltage may be analog or digital. In a specific embodiment, multiple tuning diodes, and both analog and digital control voltages are used. The isolation resistor is outside the VCO tank circuit for low phase noise, excessive Kvco is reduced, and the control and output voltages of the oscillator may swing over the entire supply range. The varactor capacitance may be junction, MOS, or other type of varactor.

    摘要翻译： 用于调谐压控振荡器的电路和方法。 控制电压通过隔离电阻施加到变容二极管。 变容二极管电容通过第二电容进行交流耦合。 控制电压可以是模拟或数字。 在具体实施例中，使用多个调谐二极管以及模拟和数字控制电压两者。 隔离电阻在VCO振荡电路之外，用于低相位噪声，过低的Kvco会降低，并且振荡器的控制和输出电压可能在整个电源范围内摆动。 变容二极管电容可以是结，MOS或其他类型的变容二极管。

    Local oscillator architecture to reduce transmitter pulling effect and minimize unwanted sideband
    2.
    发明授权
    Local oscillator architecture to reduce transmitter pulling effect and minimize unwanted sideband 有权
    本地振荡器架构可减少发射机的拉动效应，并尽量减少不必要的边带

    公开(公告)号：US06850749B2

    公开(公告)日：2005-02-01

    申请号：US10113846

    申请日：2002-03-27

    申请人： Chet Soorapanth ,  Behzad Razavi ,  Pengfei Zhang

    发明人： Chet Soorapanth ,  Behzad Razavi ,  Pengfei Zhang

    IPC分类号： H03B5/12 ,  H03B21/01 ,  H03B27/00 ,  H04B1/26

    CPC分类号： H03B27/00 ,  H03B5/1209 ,  H03B5/1228 ,  H03B21/01 ,  H03B2200/0078

    摘要： A local oscillator architecture provides a signal at an output frequency with reduced pulling effect. A voltage controlled oscillator (VCO) generates a first signal having a frequency that is a fraction of the output frequency. A frequency shifter generates a second signal with a frequency substantially equal to the difference between the VCO frequency and the output frequency. Single-sideband mixers are used to produce output signals at the sum of the VCO frequency and the shifted frequency while suppressing an unwanted sideband at the difference of the two frequencies.

    摘要翻译： 本地振荡器架构以输出频率提供信号，具有减小的拉动效果。 压控振荡器（VCO）产生具有小于输出频率的频率的第一信号。 频移器产生频率基本上等于VCO频率与输出频率之差的第二信号。 单边带混频器用于以VCO频率和移位频率之和产生输出信号，同时抑制两个频率差的不需要的边带。