| 摘要 |
The invention relates to a line circuit and a method for matching impedance in order to have a certain impedance to a signal path. According to an embodiment said circuit comprises a first line, a second line and a terminating point in said first line. At least one impedance determining circuit is connected between said lines, said at least one impedance circuit further including at least one operational amplifier, at least one multiplexer controllable by a control unit and at least one impedance net. The connection of said at least one impedance circuit is arranged such that an output of the operational amplifier is connected to an inverting input thereof, said impedance net being connected between the output of said amplifier and said terminating point of the line circuit. The arrangement is such that a non-inverting input of the operational amplifier is connectable by at least one respective multiplexer either to the terminating point or to said second line. According to an alternative embodiment said circuit comprises a single line. |
