HEADPHONE DRIVER FOR ATTENUATING POP AND CLICK NOISES AND SYSTEM ON CHIP HAVING THE SAME

摘要

A headphone driver includes a pre-main amplifier and a main amplifier. The pre-main amplifier receives an input signal from first and second node and outputs the input signal to a third node. The main amplifier is between the third node and a fourth node. A first switch is between the fourth node and a fifth node. A second switch is between the fourth node and a sixth node. A third switch is between the fourth node and a seventh node. A fourth switch is between the fifth and seventh nodes. A fifth switch is between the first and fifth nodes. A capacitor is between the third and fifth nodes. A first feedback resistor is between the first and seventh nodes. A second feedback resistor is between the second and sixth nodes, and the sixth and seventh nodes are connected to a speaker.

主权项

1. A headphone driver, comprising:
at least one pre-main amplifier to receive an input signal from a first node and a second node, and to output the input signal to a third node; a main amplifier connected between the third node and a fourth node; a first switch connected between the fourth node and a fifth node; a second switch connected between the fourth node and a sixth node; a third switch connected between the fourth node and a seventh node; a fourth switch connected between the fifth node and the seventh node; a fifth switch connected between the first node and the fifth node; a capacitor connected between the third node and the fifth node; a first feedback resistor connected between the first node and the seventh node; and a second feedback resistor connected between the second node and the sixth node, wherein the sixth node and the seventh node are connected to a speaker.