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    • 3. 发明申请
    • Tunable high-order bessel low pass filter
    • 可调式高阶贝塞尔低通滤波器
    • US20050134398A1
    • 2005-06-23
    • US10858925
    • 2004-06-01
    • Seung MyongKwang KimJyung LeeSang Lim
    • Seung MyongKwang KimJyung LeeSang Lim
    • H03H9/46H03H7/12
    • H03H7/12
    • A tunable high-order Bessel low pass filter which is applied to a multi-rate duobinary generation system of an optical communication system. The tunable Bessel low pass filter comprises a variable inductor circuit including a plurality of variable inductors connected in series between an input signal terminal and an output signal terminal and controlled respectively by corresponding inductance control signals, a variable capacitor circuit including a plurality of variable capacitors connected respectively between corresponding connection nodes of the plurality of variable inductors of the variable inductor circuit and a ground terminal and controlled respectively by corresponding capacitance control signals, and a variable capacitor/inductor controller for outputting the corresponding capacitance control signals to the variable capacitors of the variable capacitor circuit and the corresponding inductance control signals to the variable inductors of the variable inductor circuit on the basis of preset values according to a given data rate, respectively. When the data rate of an application system is changed, the tunable Bessel low pass filter controls its filtering characteristics most appropriately to the changed data rate, so as to extend its application range and enhance performance and efficiency of the application system.
    • 一种可调谐的高阶贝塞尔低通滤波器,适用于光通信系统的多速率二进制生成系统。 可调谐贝塞尔低通滤波器包括可变电感器电路,其包括串联连接在输入信号端子和输出信号端子之间的多个可变电感器,分别由相应的电感控制信号控制,可变电容器电路包括多个连接的可变电容器 分别在可变电感器电路的多个可变电感器的相应连接节点和接地端子之间分别由相应的电容控制信号控制;以及可变电容器/电感器控制器,用于将相应的电容控制信号输出到变量的可变电容器 电容器电路和相应的电感控制信号分别根据给定的数据速率在可变电感器的可变电感器的基础上进行预设值。 当应用系统的数据速率发生变化时,可调式贝塞尔低通滤波器最适合改变数据速率控制其滤波特性,从而扩展其应用范围,提高应用系统的性能和效率。
    • 7. 发明申请
    • Apparatus for controlling decision threshold voltage to optical receiver
    • 用于控制光接收机的判定阈值电压的装置
    • US20050135818A1
    • 2005-06-23
    • US10815064
    • 2004-03-31
    • Jyung LeeSeung MyongJoon LeeKwang Kim
    • Jyung LeeSeung MyongJoon LeeKwang Kim
    • H04B10/06H04B10/158
    • H04B10/695
    • Disclosed herein is an apparatus for controlling a decision threshold voltage to an optical receiver, which is capable of automatically controlling the decision threshold voltage to the optical receiver appropriately to signal level decision on the basis of a low-frequency band signal component of an output signal from the optical receiver. The apparatus is adapted to control the level of the decision threshold voltage to the optical receiver, which converts an input optical signal into an electrical signal. To this end, the apparatus comprises a voltage detector for branching off part of the output signal from the optical receiver and detecting a corresponding voltage, a differential comparator for comparing the voltage detected by the voltage detector with a reference voltage inputted thereto and outputting the resulting differential voltage, a low pass filter for filtering the differential voltage from the differential comparator at a predetermined low frequency band and supplying the resulting voltage as the threshold voltage to the optical receiver, and a voltage controller for controlling the reference voltage to the differential comparator on the basis of a differential voltage between the threshold voltage from the low pass filter and a predetermined voltage corresponding to a predetermined minimum bit error rate.
    • 本文公开了一种用于控制光接收机的判定阈值电压的装置,其能够基于输出信号的低频带信号分量自动控制对光接收器的判定阈值电压以适当地进行信号电平判定 从光接收机。 该装置适于控制光接收器的判定阈值电平的电平,光接收器将输入光信号转换为电信号。 为此,该装置包括用于将来自光接收器的输出信号的一部分分支并检测相应电压的电压检测器,用于将由电压检测器检测到的电压与输入到其的参考电压进行比较的差分比较器, 差分电压,低通滤波器,用于在预定的低频带对差分比较器的差分电压进行滤波,并将得到的电压作为阈值电压提供给光接收器;以及电压控制器,用于控制差分比较器的参考电压 来自低通滤波器的阈值电压与对应于预定最小误码率的预定电压之间的差分电压的基础。