Integrated Class-D Amplifier With Active Current Sensing Suitable for Alternating Current Switches
Jiann-Jong Chen
Ho-Cheng Lin
Che-Min Kung
Yuh-Shyan Hwang
Juing-Huei Su
Dept. of Electron. Eng., Nat. Taipei Univ. of Technol., Taipei;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug. 2008
Volume: 55,
Issue: 8
On page(s): 3141-3149
ISSN: 0278-0046
Digital Object Identifier: 10.1109/TIE.2008.921249
First Published: 2008-03-21
Current Version Published: 2008-07-29
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-$muhbox{m}$ 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.
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