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    • 2. 发明申请
    • PLL/FLL CIRCUIT WITH GAIN CONTROL
    • 具有增益控制的PLL / FLL电路
    • US20110025424A1
    • 2011-02-03
    • US12534663
    • 2009-08-03
    • Kenji MIYANAGA
    • Kenji MIYANAGA
    • H03L7/08
    • H03L7/093H03C3/0941H03C3/095H03C3/0966
    • An FLL circuit having a capability of configuring a desired loop bandwidth in a short period of time is provided. An FDC 17 generates a feedback of an output signal of a VCO 15. An error detector 11 detects an error of the output signal of the VCO 15. A voltage retainer 13 retains an output of a control voltage of the VCO 15. A reference signal generator 16 generates a reference signal. An adder 14 adds the reference signal to a control voltage outputted by the voltage retainer 13. A Kv calculator 18 calculates a gain Kv of the VCO 15 based on a degree of transition of an output frequency of the VCO 15. A loop bandwidth controller 19 adjusts, based on the gain Kv of the VCO 15, a gain of a loop filter 12 to an optimum value, and configures a desired loop bandwidth.
    • 提供了具有在短时间内配置期望的环路带宽的能力的FLL电路。 FDC17产生VCO15的输出信号的反馈。误差检测器11检测VCO15的输出信号的误差。电压保持器13保持VCO15的控制电压的输出。参考信号 发生器16产生参考信号。 加法器14将参考信号与由电压保持器13输出的控制电压相加.Kv计算器18基于VCO15的输出频率的转变程度来计算VCO 15的增益Kv。环路带宽控制器19 基于VCO15的增益Kv将环路滤波器12的增益调整到最佳值,并且配置期望的环路带宽。