An analog sigma-delta modulator with shared operational amplifier for low-power class-D audio amplifier

IEICE Electronics Express

Changsik Yoo¹  Jisoo Lee²  Jinho Noh¹ 

[1] Department of Electronic Engineering, Hanyang University;Samsung Electronics

关键词: CMOS;    class-D amplifier;    operational amplifier;    hearing aid;    sigma-delta modulator;   

DOI  :  10.1587/elex.12.20150562

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(21)To minimize the power consumption of an analog sigma-delta modulator (SDM), a fifth-order loop filter of the SDM has been realized with only three operational amplifiers (op-amp). The analog SDM with shared op-amp is applied to a class-D amplifier for a digital hearing aid. The class-D amplifier with the analog SDM has been realized in a standard 0.13-µm CMOS process. The maximum output power level of the class-D amplifier is 1.13-mW for a load with 46.5-Ω DC resistance. The total harmonic distortion+noise (THD+N) and the dynamic range (DR) of the class-D amplifier are 0.0038-% and 96-dB, respectively. The fifth-order analog SDM with shared op-amp consumes only 0.2-mW from a 1.2-V power supply.

【 授权许可】

Unknown