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    • 10. 发明授权
    • Electronic tuning circuit for AM receiver
    • AM接收机电子调谐电路
    • US4847572A
    • 1989-07-11
    • US113519
    • 1987-10-28
    • Hajime Yokoyama
    • Hajime Yokoyama
    • H03J3/18H03J3/32
    • H03J3/185H03J3/32
    • In an electronic tuning circuit for AM receiver including a radio-frequency tuning circuit and local oscillator circuit each using a variable capacitance diode, the local oscillator circuit comprises an oscillation coil; a padding capacitor connected in series with the oscillation coil; a first variable capacitance diode connected at one end in series with the oscillation coil; a first and a second fixed capacitor connected at one end in series with each other; and a second variable capacitance diode connected in parallel with the second fixed capacitor. The second fixed capacitor has its other end connected to a connection point between the padding capacitor and the first variable capacitance diode. The first fixed capacitor has its other end connected to the connection point between the oscillation coil and one end of the first variable capacitance diode. A tuning voltage is applied to the first and second variable capacitance diodes, thereby reducing tracking error over the entire receiving frequency band.
    • 在AM接收机的电子调谐电路中,包括使用变容二极管的射频调谐电路和本机振荡电路,本振电路包括振荡线圈; 与振荡线圈串联连接的填充电容器; 一端与振荡线圈串联连接的第一可变电容二极管; 在一端串联连接的第一固定电容器和第二固定电容器; 以及与第二固定电容器并联连接的第二可变电容二极管。 第二固定电容器的另一端连接到填充电容器和第一可变电容二极管之间的连接点。 第一固定电容器的另一端连接到振荡线圈与第一可变电容二极管的一端之间的连接点。 调谐电压施加到第一和第二可变电容二极管,从而减少整个接收频带的跟踪误差。