Patent ID: 8600041

Claim:
A method for improving power output efficiency of a line driver, the method comprising: obtaining a current working parameter of an xDSL subscriber board, wherein the current working parameter comprises at least one of a working mode configured on a subscriber port of the xDSL subscriber board and current output power of the subscriber port; and determining, according to the current working parameter, a control signal that matches the current working parameter for a line driver in the xDSL subscriber board, and outputting the control signal, wherein the control signal comprises a first control signal, a second control signal, and a third control signal; the first control signal is used to control a power source module that provides a minimum undistorted power supply voltage according to the first control signal, wherein the minimum undistorted power supply voltage is a minimum voltage value for the line driver satisfying a voltage requirement of the line driver; the second control signal is used to control a predetermined threshold level in a signal detection and charge pump circuit of the line driver, the predetermined threshold level is a voltage threshold value of an input signal for enabling the power supply voltage of the line driver to follow a voltage waveform of an output signal; and the third control signal is used to control enabling or disabling of the signal detection and charge pump circuit.