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公开(公告)号：US4229625A
公开(公告)日：1980-10-21
申请号：US974380
申请日：1978-12-29
申请人： Jeffrey H. Derby , Tadikonda N. Rao
发明人： Jeffrey H. Derby , Tadikonda N. Rao
IPC分类号： H04B3/38
CPC分类号： H04B3/38
摘要： A bilateral transmission line repeater is disclosed in which opposite directions of transmission are separated into different frequency bands. The amplifiers for each direction of transmission include an automatic gain control circuit for controlling the gain of the amplifier. Gain control for the inward bound amplifier (toward a central location such as a telephone central office) is under the control of an automatic gain control signal derived from the outward bound signal as well as from the inward bound signal. Feedback around the gain control amplifier is accomplished using a current mirror circuit to avoid loading the amplifier output.
摘要翻译： 公开了一种双向传输线路中继器，其中相反的传输方向被分成不同的频带。 用于每个传输方向的放大器包括用于控制放大器的增益的自动增益控制电路。 用于向内限制放大器（朝向中心位置，例如电话中心局）的增益控制受到从向外限制信号以及从内向限制信号导出的自动增益控制信号的控制。 增益控制放大器周围的反馈是使用电流镜电路来实现的，以避免加载放大器输出。
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公开(公告)号：US4253131A
公开(公告)日：1981-02-24
申请号：US974388
申请日：1978-12-29
摘要： A bilateral repeater for communication transmission lines is described in which the opposite directions of transmission are separated by frequency bands for amplification. The repeater is powered from a power conversion unit energized from the line potential. The repeater includes three-electrode gas tube breakdown devices connected across the repeater for each conductor of the transmission line. The third electrodes in the gas tubes are cross-connected together with no ground connection.
摘要翻译： 描述了用于通信传输线的双向中继器，其中相反的传输方向被用于放大的频带分开。 中继器由从线路电位通电的电力转换单元供电。 中继器包括用于传输线的每个导体的中继器连接的三电极气体管击穿装置。 气体管道中的第三个电极交叉连接在一起，没有接地连接。
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公开(公告)号：US4220987A
公开(公告)日：1980-09-02
申请号：US974381
申请日：1978-12-29
IPC分类号： H02M3/335
CPC分类号： H02M3/33507
摘要： A power converter circuit is disclosed utilizing pulse width modulation for power regulation. A rapid acting surge protection circuit for the power driving switch is operated from a string of zener diodes to disable the power switch. A base charge removal circuit is included for dissipating accumulated base charges on the driving transistor without the need for a bipolar driving signal for the power transistor.
摘要翻译： 公开了一种功率转换器电路，利用用于功率调节的脉冲宽度调制。 用于电力驱动开关的快速动作浪涌保护电路由一串齐纳二极管操作以禁用电源开关。 包括基极电荷去除电路，用于耗散驱动晶体管上累积的基极电荷，而不需要用于功率晶体管的双极驱动信号。
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