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    Binary phase shift key modulator with programmable level control
    3.
    发明授权
    Binary phase shift key modulator with programmable level control 失效
    具有可编程电平控制的二进制相移键控调制器

    公开(公告)号：US5045816A

    公开(公告)日：1991-09-03

    申请号：US503423

    申请日：1990-04-02

    申请人： Charles R. Bramhall ,  Lamar E. West, Jr. ,  Jesse M. Still ,  Emory L. McGinty, Jr.

    发明人： Charles R. Bramhall ,  Lamar E. West, Jr. ,  Jesse M. Still ,  Emory L. McGinty, Jr.

    IPC分类号： H04L27/20 ,  H04N21/258 ,  H04N21/442

    CPC分类号： H04N21/44222 ,  H04L27/2035 ,  H04N21/25891

    摘要： A BPSK modulator for modulating a data signal onto a carrier signal comprises first and second transistors connected in a mirror configuration and a center tap transformer. The collectors of the first and second transistors are coupled to a first winding of the center tap transformer and the BPSK modulated carrier signal is provided at the output of the transformer. Unmodulated data is input to each of the bases of the first and second transistors. The emitters of the first and second transistors are coupled to the collector of a third transistor whose base receives the carrier signal. A programmable gain control circuit is also coupled to the base of the third transistor for step-wise adjustment of the transmit level of the BPSK modulated carrier signal. In this manner, the transmit output level of the modulator may be adjusted when necessary in the event of changing environmental or other considerations.

    摘要翻译： 用于将数据信号调制到载波信号上的BPSK调制器包括以镜像配置连接的第一和第二晶体管和中心抽头变压器。 第一和第二晶体管的集电极耦合到中心抽头变压器的第一绕组，并且在变压器的输出处提供BPSK调制载波信号。 未调制的数据被输入到第一和第二晶体管的每个基极。 第一和第二晶体管的发射极耦合到基极接收载波信号的第三晶体管的集电极。 可编程增益控制电路也耦合到第三晶体管的基极，用于逐步调整BPSK调制载波信号的发射电平。 以这种方式，调节器的发送输出电平可以在需要时在环境变化或其他考虑的情况下进行调整。