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    • 8. 发明授权
    • Circuit arrangement for controlling the level of electrical signals
    • 用于控制电信号电平的电路布置
    • US5039887A
    • 1991-08-13
    • US575406
    • 1990-08-29
    • Martin BrahmsAndreas HennigAndreas Timmermann
    • Martin BrahmsAndreas HennigAndreas Timmermann
    • H03G3/20H03G3/30
    • H03G3/3073
    • For controlling the level of electrical signals a circuit arrangement is formed with two series connected amplifiers. A first amplifier containing a first variable resistor, operates at maximum amplification when a low input signal level is received. A second amplifier comprises a series connection of a second variable resistor and a current-controlled voltage source with two complementary outputs. The outputs of the voltage source are connected to a comparator and a controller with two separate outputs. One of the controller outputs transmits a control signal while the other output simultaneously transmits a blocking signal. A first output of the controller is connected with the first variable resistor, while a second output of the controller is connected to the second variable resistor.
    • 为了控制电信号的电平,电路装置由两个串联连接的放大器形成。 包含第一可变电阻器的第一放大器在接收到低输入信号电平时以最大放大进行工作。 第二放大器包括具有两个互补输出的第二可变电阻器和电流控制电压源的串联连接。 电压源的输出连接到比较器和具有两个单独输出的控制器。 其中一个控制器输出发送控制信号,而另一个输出同时发送阻塞信号。 控制器的第一输出与第一可变电阻器相连,而控制器的第二输出端连接到第二可变电阻器。