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热词
    • 6. 发明授权
    • Filter switching arrangement for a tuner
    • 调谐器的滤波器开关布置
    • US4905306A
    • 1990-02-27
    • US160979
    • 1988-02-26
    • William D. Anderson
    • William D. Anderson
    • H03J5/24
    • H03J5/244
    • In a tunable filter including first and second inductors, a varactor diode, and a bandswitching diode connected intermediate the inductors to select the inductor configuration for first and second tuning bands, a capacitor is connected in parallel with the bandswitching diode. When the bandswitching diode is in the high impedance "non-conducting" state, the capacitor is functionally connected with other elements of the tunable filter for purposes such as trapping or tracking. When the bandswitching diode is in the low impedance "non-conducting" state, the capacitance is functionally disconnected from the tunable circuit.
    • 在包括第一和第二电感器的可调谐滤波器,变容二极管和连接在电感器之间的带状开关二极管,以选择用于第一和第二调谐带的电感器配置,电容器与带开关二极管并联连接。 当带状开关二极管处于高阻抗“非导通”状态时,电容器与可调谐滤波器的其他元件功能连接,用于捕获或跟踪。 当带状开关二极管处于低阻抗“非导通”状态时,电容在功能上与可调电路断开。