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    • 71. 发明授权
    • Mixing circuit utilizing linear resistances
    • 混合电路利用线性电阻
    • US3723910A
    • 1973-03-27
    • US3723910D
    • 1971-05-20
    • MOTOROLA INC
    • CANNON J
    • H03C1/54H03D7/12H03D7/14
    • H03D7/1441H03C1/547H03C2200/0079H03D7/125H03D7/1466
    • The mixing circuit employs the linear portions of the voltagecurrent characteristics of a plurality of field-effect transistors to amplitude modulate a first signal, having a first frequency, with a second signal having a second frequency thus providing an amplitude modulated signal. A differential amplifier is connected to the field-effect transistors and to the source of the first signal so that the common-mode rejection characteristic thereof is utilized to eliminate the undesired component at the first frequency from the amplitude modulated signal. As a result, virtually only the desired signal components having frequencies equal to the sum and difference of the first and second frequencies occur at the output of the amplifier.
    • 混合电路使用多个场效应晶体管的电压 - 电流特性的线性部分对具有第一频率的第一信号进行幅度调制,其中第二信号具有第二频率,从而提供幅度调制信号。 差分放大器连接到场效应晶体管和第一信号的源极,使得其共模抑制特性被用于从幅度调制信号中消除第一频率处的不期望分量。 结果,几乎只有具有等于第一和第二频率之和的频率的频率的期望的信号分量出现在放大器的输出处。