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    • 7. 发明授权
    • Current-controlled oscillator (CCO) based PLL
    • 基于电流控制振荡器(CCO)的PLL
    • US08432204B1
    • 2013-04-30
    • US13344637
    • 2012-01-06
    • Chan-Hong ChernMing-Chieh HuangTao Wen ChungChih-Chang LinYuwen SweiFu-Lung Hsueh
    • Chan-Hong ChernMing-Chieh HuangTao Wen ChungChih-Chang LinYuwen SweiFu-Lung Hsueh
    • H03L7/06
    • H03L7/102H03L7/099H03L7/104
    • A PLL circuit includes a phase frequency detector; a programmable charge pump coupled to an output of the phase frequency detector; a loop filter coupled to an output of the charge pump, the loop filter providing a fine tuning voltage; a first voltage-to-current converter, the first voltage-to-current converter providing a fine tuning current corresponding to the fine tuning voltage; a current-controlled oscillator (CCO); a feedback divider coupled to an output of the CCO and an input of the phase frequency detector; and an analog calibration circuit. The analog calibration circuit provides a coarse adjustment current for coarse adjustments to a frequency pivot point for an oscillator frequency of the CCO, wherein the CCO generates a frequency signal at an output responsive to a summed coarse adjustment and fine tuning current, wherein the frequency pivot point is continuously adjustable.
    • PLL电路包括相位检波器; 耦合到所述相位频率检测器的输出的可编程电荷泵; 耦合到电荷泵的输出的环路滤波器,所述环路滤波器提供微调电压; 第一电压 - 电流转换器,第一电压 - 电流转换器提供对应于微调电压的微调电流; 电流控制振荡器(CCO); 耦合到CCO的输出的反馈分压器和相位频率检测器的输入端; 和模拟校准电路。 模拟校准电路提供用于对CCO的振荡器频率的频率枢转点进行粗调整的粗调电流,其中CCO响应于总和的粗调和微调电流而在输出端产生频率信号,其中频率枢轴 点连续可调。
    • 9. 发明授权
    • Decision feedback equalizer
    • 决策反馈均衡器
    • US08862951B2
    • 2014-10-14
    • US13528877
    • 2012-06-21
    • Ming-Chieh HuangChan-Hong ChernTao Wen ChungYuwen SweiChih-Chang LinTsung-Ching Huang
    • Ming-Chieh HuangChan-Hong ChernTao Wen ChungYuwen SweiChih-Chang LinTsung-Ching Huang
    • G06F11/00H04L27/01
    • H04L25/03057H04L25/06H04L25/08
    • A circuit includes a summation circuit for receiving an input data signal and a feedback signal including a previous data bit. The summation circuit is configured to output a conditioned input data signal to a clock and data recovery circuit. A first flip-flop is coupled to an output of the summation circuit and is configured to receive a first set of bits of the conditioned input data signal and a first clock signal having a frequency that is less than a frequency at which the input data signal is received by the first summation circuit. A second flip-flop is coupled to the output of the summation circuit and is configured to receive a second set of bits of the conditioned input data signal and a second clock signal having a frequency that is less than the frequency at which the input data signal is received by the first summation circuit.
    • 电路包括用于接收输入数据信号和包括先前数据位的反馈信号的求和电路。 求和电路被配置为将调节的输入数据信号输出到时钟和数据恢复电路。 第一触发器耦合到求和电路的输出,并且被配置为接收经调节的输入数据信号的第一比特组和具有小于输入数据信号的频率的频率的第一时钟信号 由第一求和电路接收。 第二触发器耦合到求和电路的输出,并且被配置为接收经调节的输入数据信号的第二组比特和具有小于输入数据信号的频率的频率的第二时钟信号 由第一求和电路接收。