IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
A new stereo enhancement circuit for class-D amplifier
Lianxi LiuShijie DengZhangming ZhuYanhong LiHuaxi Gu
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2013 Volume 10 Issue 6 Pages 20130115


This paper presents a novel stereo enhancement structure for the surround stereo class-D audio amplifier. The principle of this stereo enhancement scheme has been analyzed. It shows that the amplifier with this proposed circuit have a better live effect than the traditional class-D audio amplifiers. In this circuit, the input audio signal from one channel can be amplified in the two channels at the same time, by a way of cross-coupling. The ratio of gains in the two channels also can be adjusted by changing the external resistance, which improves the stereo effect. A practical implementation in a CMOS 0.18-µm process has been done to validate the theoretical results. When a sine signal with 1KHz frequency and 100mV amplitude is applied in one channel, and a DC applied signal in the other, the amplifier demonstrates a gain difference of 9.4dB.

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© 2013 by The Institute of Electronics, Information and Communication Engineers
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