| 摘要 |
The invention relates to a method of matching a line driver circuit for different transmission lines having mutually different characteristic impedances and to a line driver circuit. The line driver circuit comprises a driver stage (11) and a transformer provided with primary and secondary windings (12a, 12b) in such a way that each output terminal of the driver stage (11) is connected to the corresponding terminal of the primary winding (12a) of the transformer via an output resistor (R) and the secondary winding (12b) of the transformer is connected to a transmission line (13). To enable an automatic change of the impedance level of the transmission line without any changes being necessary in the line driver circuit, the matching is carried out by searching for output resistances and turns of the transformer for values (Ropt, nopt), which simultaneously provide the signal level required by each transmission line. |
