Patent ID: 8093944

Claim:
A line driver comprising: an output terminal set that includes a first output terminal and a second output terminal for outputting an output signal; a differential amplifier for amplifying an input signal, said differential amplifier including an inverting input terminal, a non-inverting input terminal, an inverting output terminal, and a non-inverting output terminal, said inverting input terminal and said non-inverting input terminal being adapted for receiving the input signal; a series resistor set including a first series resistor coupled between said non-inverting output terminal of said differential amplifier and said first output terminal, and a second series resistor coupled between said inverting output terminal of said differential amplifier and said second output terminal; a negative-feedback resistor set including a first negative-feedback resistor coupled between said inverting input terminal and said non-inverting output terminal of said differential amplifier, and a second negative-feedback resistor coupled between said non-inverting input terminal and said inverting output terminal of said differential amplifier; a feedback variable resistor set including a first feedback variable resistor coupled between said inverting input terminal of said differential amplifier and said first output terminal, and a second feedback variable resistor coupled between said non-inverting input terminal of said differential amplifier and said second output terminal; and an adjusting unit coupled to said feedback variable resistor set, and operable to adjust resistances of said first and second feedback variable resistors of said feedback variable resistor set according to the output signal.