Patent ID: 8405431

Claim:
A line driver, comprising: a current replication unit, replicating a reference current according to an input signal; a current mapping unit, electrically connected to the current replication unit and comprising a plurality of first P channel transistors, wherein the current mapping unit adjusts a number of the P channel transistors connected in parallel according to control information, so as to amplify the reference current according to a magnification value and generate a driving current; a first resistor, electrically connected between the current replication unit and a direct-current voltage, so as to determine the reference current; a second resistor, electrically connected to the current replication unit and the current mapping unit, so as to generate an output signal; a signal detection unit, performing integration on a part of a difference between the input signal and the output signal, so as to generate an integration signal; and a magnification control unit, generating the control information and gradually adjusting magnification information related to the reference signal so that the reference signal and the integration signal are equal, wherein when the reference signal and the integration signal are equal, the magnification control unit updates the control information by the magnification information.