DocumentCode
1948067
Title
A class-D amplifier using a spectrum shaping technique [audio power amplifier]
Author
Yasuda, Akira ; Kimura, Takashi ; Ochiai, Koichiro ; Hamasaki, Toshihiko
Author_Institution
Fac. of Eng., Hosei Univ., Tokyo, Japan
fYear
2004
fDate
3-6 Oct. 2004
Firstpage
173
Lastpage
176
Abstract
In this paper, we propose a new class-D amplifier with a lower-frequency reference signal by using a spectrum shaping technique, in order to reduce the out-of-band noise, which improves interference problems even when radio equipment is independently designed. The peak-level of the measured out-of-band noise is 15 dB lower than conventional class-D amplifiers. The chip realizes a THD of 0.45% and SNR of 81 dB. The test chip can operate with a single 2 V power supply.
Keywords
audio-frequency amplifiers; interference (signal); power amplifiers; 2 V; audio power amplifiers; class-D amplifier; low-frequency reference signal; out-of-band noise reduction; power efficiency; radio interference; spectrum shaping technique; Interference; Low-noise amplifiers; Noise measurement; Noise reduction; Noise shaping; Power amplifiers; Semiconductor device measurement; Signal design; Signal to noise ratio; Testing;
fLanguage
English
Publisher
ieee
Conference_Titel
Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004
Print_ISBN
0-7803-8495-4
Type
conf
DOI
10.1109/CICC.2004.1358768
Filename
1358768
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