| 摘要 |
A device for controlling a closed circuit current for an amplifier transistor (T4), comprising a control connection (10c) and a first and second connection (10a, 10b) which are arranged in such a way that the closed circuit current can flow through the amplifier transistor (T4) via the first and second connection (10a, 10b). Said device also comprises a current balancing transistor (T3) which forms a current balancing device, together with the amplifier transistor (T4). The device further comprises a detection device (T2, R1) with a detection transistor for detecting the voltage at the first connection (13a) of the current balancing transistor (13) and for delivering an output signal in reaction to the voltage at the first connection (13a) of the current balancing transistor (13), a feedback device (T1) for receiving the output signal of the detection device and for delivering a feedback signal, which is dependent upon the output signal of the detection device, to the control connection (13c) of the current balancing transistor (T3), and a resistive device (R3) with two connections, the first connection of the resistive device (R3) being able to be connected to a voltage (18), the second connection of the resistive device (R3) being connected to the first connection (13a) of the current balancing transformer in such a way that electric current can be controlled according to the voltage (18) flowing through the resistive device on the basis of a signal to the control connection (13c) of the current balancing transistor. |
