| 摘要 |
A driving circuit for a transceiver output port of a local area networking device is provided, including first and second current sources coupled to the ground, first and second resistors coupled to the supply voltage with the resistances of the first and second resistors each being equal to half that of the equivalent resistance of the cable for the purpose of impedance matching, and third and fourth current sources coupled to the cable for providing additional currents while the first and second current sources are operating such that the magnitude of the differential output signal is determined not only according to the first and second currents but also according to the third and fourth currents.
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