A Class D Amplifier Using Current Controlled PWM

• Main Authors: Yuan-Kai Cheng, 鄭元凱
• Other Authors: Hong-Yi Huang
• Format: Others
• Language: en_US
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/08917668981814968442

碩士 === 國立臺北大學 === 電機工程研究所 === 98 === This paper presents a single-chip digital audio amplifier based on a current controlled pulse width modulator and a power-efficient switching (Class-D) output-stage fabricated in TSMC 0.18-µm standard CMOS process. It has a measured total harmonic distortion (THD) at the speaker terminals of less than 0.2%. An efficiency of 86% can be achieved with an 8-Ω speaker. The maximum output power is 191mW (rms) from a single 1.8-V power supply, and the stand-by power consumption is only 1.44mW (load connected). This work demonstrates the feasibility of implementing Class-D amplifiers with a high-end audio performance for portable devices.