Patent ID: 9130513
Filing Date: 2015-09-08
Classification: H03F

Abstract:
1. An audio signal amplifying device, comprising: a receiving unit that receives an audio signal; a carrier wave generation unit that generates first, second, third, and fourth carrier waves, the first, second, third, and fourth carrier waves having phases that are different from one another; an amplified modulation signal generation unit that compares voltage values of the first carrier wave and the second carrier wave to the audio signal, respectively, generates a first modulation signal and a second modulation signal, respectively, based on results of the voltage value comparisons, amplifies the first modulation signal and the second modulation signal, respectively, based on a value of a first power supply voltage, and generates a first amplified modulation signal and a second amplified modulation signal from the amplified first modulation signal and the amplified second modulation signal, respectively; a first output unit that outputs a first output, voltage values of the first output comprising one of the first amplified modulation signal or a second power supply voltage, according to a logic state of a third modulation signal, the third modulation signal generated from a result of comparing the third carrier wave to the audio signal; a second output unit that outputs a second output, voltage values of the second output comprising one of the second amplified modulation signal or the second power supply voltage, according to a logic state of a fourth modulation signal, the fourth modulation signal generated from a result of comparing the fourth carrier wave to the audio signal; and a final output unit that synthesizes the first output and the second output, and outputs the synthesized signal in which voltage values can be double of the first power supply voltage or double of the second power supply voltage.