| 摘要 |
Am amplifier device with remote power supply via a transmission line via which an alternating current signal is transmitted simultaneously with the supply current (from or to the amplifier device). A damping control unit damps the alternating current signal such that the damping differences between long and short transmission lines are equalized. To this end the amplifier device comprises a reference current source, the current of which is independent of variations in the supply voltage. Furthermore, means are provided for generating a control current which is equal to the difference between a constant current which is derived from the current source and a current which is linearly dependent of the supply current. This control current controls a controlled amplifier, the amplification of which is a monotonously decreasing function of the supply current. |
