Integrated Class-D Amplifier With Active Current Sensing Suitable for Alternating Current Switches

Author

Chen, Jiann-Jong ; Lin, Ho-Cheng ; Kung, Che-Min ; Hwang, Yuh-Shyan ; Su, Juing-Huei

Author_Institution

Dept. of Electron. Eng., Nat. Taipei Univ. of Technol., Taipei

Volume

55

Issue

8

fYear

2008

Firstpage

3141

Lastpage

3149

Abstract

An integrated class-D amplifier with active current sensing suitable for AC switches is presented in this paper. The proposed current-sensing technique is used to sense and control the inductor current at the output stage and allows the current-sensing element to be integrated into class-D amplifiers. To verify the performance of the proposed circuits, a class-D amplifier was designed and fabricated with 3.3-V 0.35- mum double-polyquadruple-metal CMOS technology on a chip area of 1.79 times 1.45 mm. The maximum power efficiency of the class-D amplifier can be up to 94% for an 8-Omega load. These active current-sensing circuits can be applied to other power converters with AC switches.

Keywords

CMOS integrated circuits; power amplifiers; power convertors; switches; AC switches; active current sensing; alternating current switches; double-polyquadruple-metal CMOS technology; integrated class-D amplifier; power converters; Active current-sensing circuit; Battery Charge System; Grey-Predicted; Li-ion Battery; class-D amplifier;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2008.921249

Filename

4475518