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公开(公告)号：US09270261B2
公开(公告)日：2016-02-23
申请号：US14326323
申请日：2014-07-08
申请人： FUJITSU LIMITED
发明人： Jian Hong Jiang
CPC分类号： H03K5/14 , G11C2207/107 , H03L7/0812
摘要： A circuit may include a phase detector circuit, a charge pump circuit, a delay circuit, and a multiplexer circuit. The phase detector circuit may be configured to output a comparison signal based on a comparison of a phase of an inversion of a first clock signal and a phase of a multiplexer signal. The charge pump may be configured to integrate the comparison signal and to output a control voltage based on the integration of the comparison signal. The delay circuit may be configured to receive a second clock signal, to delay the second clock signal based on the control voltage, and to output the delayed second clock signal. The second clock signal may be a divided version of the first clock signal. The multiplexer circuit may be configured to output the multiplexer signal based on the delayed second clock signal.
摘要翻译： 电路可以包括相位检测器电路，电荷泵电路，延迟电路和多路复用器电路。 相位检测器电路可以被配置为基于第一时钟信号的反相和多路复用器信号的相位的比较来输出比较信号。 电荷泵可以被配置为集成比较信号并且基于比较信号的积分来输出控制电压。 延迟电路可以被配置为接收第二时钟信号，以基于控制电压延迟第二时钟信号，并输出延迟的第二时钟信号。 第二时钟信号可以是第一时钟信号的分割版本。 复用器电路可以被配置为基于延迟的第二时钟信号来输出多路复用器信号。
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公开(公告)号：US20170201327A1
公开(公告)日：2017-07-13
申请号：US14990723
申请日：2016-01-07
申请人： Fujitsu Limited
发明人： Jian Hong Jiang
CPC分类号： H04B10/616 , H03F3/082 , H03F3/45475 , H03F3/45645 , H03F3/45753 , H03F2200/453 , H03F2203/45288
摘要： A method and system for amplifying small optical currents in an optical receiver front end system may employ multiple transimpendance amplifiers (TIAs) and feedback control loops. For example, the front end system may include a main feedback control loop (having a main TIA) and a replica feedback control loop (having a replica TIA) that, collectively, generate an optimum input common mode level for a differential amplifier operating at high data rates (e.g., speeds up to tens of gigabits per second). The replica TIA may track the noise from the power supply of the optical receiver in the substantially same manner as the main TIA. Therefore, the differential signals produced by the main control loop may not be degraded at the input to the high-speed differential amplifier. The outputs of the high-speed differential amplifier may be symmetric about the common mode level and may be suitable inputs for voltage sampling.
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公开(公告)号：US09794001B2
公开(公告)日：2017-10-17
申请号：US14990723
申请日：2016-01-07
申请人： Fujitsu Limited
发明人： Jian Hong Jiang
CPC分类号： H04B10/616 , H03F3/082 , H03F3/45475 , H03F3/45645 , H03F3/45753 , H03F2200/453 , H03F2203/45288
摘要： A method and system for amplifying small optical currents in an optical receiver front end system may employ multiple transimpendance amplifiers (TIAs) and feedback control loops. For example, the front end system may include a main feedback control loop (having a main TIA) and a replica feedback control loop (having a replica TIA) that, collectively, generate an optimum input common mode level for a differential amplifier operating at high data rates (e.g., speeds up to tens of gigabits per second). The replica TIA may track the noise from the power supply of the optical receiver in the substantially same manner as the main TIA. Therefore, the differential signals produced by the main control loop may not be degraded at the input to the high-speed differential amplifier. The outputs of the high-speed differential amplifier may be symmetric about the common mode level and may be suitable inputs for voltage sampling.
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