Delta Sigma Modulated Class D Audio Amplifier
Date Issued
2006
Date
2006
Author(s)
Ru, Liao - Tze
DOI
en-US
Abstract
In the portable devices such as PDA, MP3 player or mobile phone and mobile amusement system, the battery life is a very important issue. In order to strengthen the battery lifetime, the high power efficiency will be better.
The efficiency of power amplifier is very important. The traditional class A or class AB have lower efficiency than class D. The efficiency of class D will achieve 100% theoretically.
The class D audio amplifier is usually with PWM modulator or delta sigma modulator to transform the input signal to a series of pulse signal to control the class D circuit. The traditional PWM modulator or delta sigma modulator are all with clock circuit inside. In order to reduce the clock circuit, a delta sigma modulator with hysteresis comparator is presented in this thesis. In this topology, we can save the chip area and also can achieve a good performance in THD and efficiency. The THD is 0.9% and the efficiency is 87% with 10K Hz input signal in this thesis.
Subjects
D類放大器
三角積分器
Delta Sigma
Class D
Type
thesis
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