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    Optical PCM group transmission repeating system
    1.
    发明授权
    Optical PCM group transmission repeating system 失效
    光PCM组传输重复系统

    公开(公告)号：US4074127A

    公开(公告)日：1978-02-14

    申请号：US717273

    申请日：1976-08-24

    申请人： Yukou Mochida ,  Tadao Ogawa ,  Kazuo Yamaguchi

    发明人： Yukou Mochida ,  Tadao Ogawa ,  Kazuo Yamaguchi

    IPC分类号： H04B10/29 ,  H04B10/00 ,  H04B10/524 ,  H04B10/564 ,  H04J3/08 ,  H04L25/52 ,  H04B9/00

    CPC分类号： H04B10/2935 ,  H04B10/524

    摘要： An optical fiber communication system using group transmission which transmits PCM information by utilizing an optical fiber group composed of a plurality of optical fibers. The PCM information in a plurality of optical fibers is stored in a memory of the system's sending terminal, the stored information of each memory is read out by simultaneous clock pulses so as to send out the information to a transmission line which is composed of a plurality of said optical fibers. A repeater is provided in the transmission line having at least one of the following circuits, an AGC circuit, a light element control circuit, a power supply circuit and a supervisory circuit. The supervisory circuit is commonly provided for checking a plurality of signals which is transmitted by the above-mentioned optical fibers. In the repeater, the signals are regenerated by simultaneous clock pulses which are generated from one common timing circuit, and the phases of the signals are arranged in order for sending out said signals to the transmission line composed of said optical fibers.

    摘要翻译： 一种使用组发送的光纤通信系统，其通过利用由多根光纤构成的光纤组来发送PCM信息。 多个光纤中的PCM信息被存储在系统的发送终端的存储器中，通过同时的时钟脉冲读出每个存储器的存储信息，以便将信息发送到由多个光纤组成的传输线 的所述光纤。 在传输线中设置有至少一个以下电路，AGC电路，光元件控制电路，电源电路和监控电路的中继器。 通常提供监视电路来检查由上述光纤发送的多个信号。 在中继器中，通过从一个公共定时电路产生的同步时钟脉冲来再生信号，并且将信号的相位排列以将所述信号发送到由所述光纤组成的传输线。

    Low noise amplifier circuit with reduced low-frequency gain
    4.
    发明授权
    Low noise amplifier circuit with reduced low-frequency gain 失效
    低噪声放大器电路具有降低的低频增益

    公开(公告)号：US4370624A

    公开(公告)日：1983-01-25

    申请号：US211050

    申请日：1980-11-28

    申请人： Tadao Ogawa ,  Nobuhide Yamaguchi

    发明人： Tadao Ogawa ,  Nobuhide Yamaguchi

    IPC分类号： H03F1/26 ,  H03F1/34 ,  H03F1/48 ,  H04B3/36

    CPC分类号： H03F1/26 ,  H03F1/34 ,  H03F1/48 ,  H04B3/36 ,  H03F2200/372

    摘要： A low noise amplifier, comprising a grounded emitter transistor amplifier having a parallel impedance element connected between base and collector and a series impedance element connected between emitter and ground. The parallel impedance element is selected to have a pole near a zero of the series impedance element, and the parallel impedance element also has a zero near a pole of the series impedance element. The impedances of the series impedance element and of the parallel impedance element vary oppositely with respect to frequency, so that the input impedance of the amplifier is constant with respect to frequency. However, by selection of two impedances which are thus matched, the gain is increased at high frequencies and slightly reduced at low frequencies. Thus, the total noise figure is improved, due to the higher gain at the higher frequency range. In addition, frequency-selective attenuation imposed by a transmission line is compensated for, so that the amplifier has increased immunity to low-frequency overload.

    摘要翻译： 一种低噪声放大器，包括接地发射极晶体管放大器，其具有连接在基极和集电极之间的并联阻抗元件以及连接在发射极和地之间的串联阻抗元件。 并联阻抗元件被选择为具有接近零序阻抗元件的零点的极点，并且并联阻抗元件在串联阻抗元件的极点附近也具有零。 串联阻抗元件和并联阻抗元件的阻抗与频率相反地变化，使得放大器的输入阻抗相对于频率是恒定的。 然而，通过选择由此匹配的两个阻抗，增益在高频率下增加并且在低频率下稍微降低。 因此，由于在较高频率范围内的较高增益，总噪声系数得到改善。 另外，由传输线施加的频率选择性衰减被补偿，使得放大器具有增强的对低频过载的抗扰性。