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
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;
Conference_Titel :
Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004
Print_ISBN :
0-7803-8495-4
DOI :
10.1109/CICC.2004.1358768
