| 摘要 |
The invention relates to a device for preparing an input signal for a line which is mismatched on the output side, and a line driver for using in one such device. The disadvantage of conventional line drivers lies in their high power dissipation. The aim of the invention is to take measures to reduce the power dissipation in the output resistance of the line driver. To this end, a line driver (20) connected to the input side of a line (10) via a resistance (30) is provided, in addition to a control device (21) for controlling, according to a data input signal, a first switch (40) for applying a supply voltage to the input side of the resistance (30), a second switch (50) for applying a reference potential to the input side of the resistance (30), and a third switch (60) for applying a first auxiliary voltage to the input side of the line (10), at predeterminable moments, in order to minimise the power dissipation in the resistance (30). |
