IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
An analog sigma-delta modulator with shared operational amplifier for low-power class-D audio amplifier
Jinho NohJisoo LeeChangsik Yoo
著者情報
ジャーナル フリー

2015 年 12 巻 17 号 p. 20150562

詳細
抄録
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.
著者関連情報
© 2015 by The Institute of Electronics, Information and Communication Engineers
前の記事 次の記事
feedback
Top