TY - JOUR
T1 - A low quiescent current, low THD+N Class-D audio amplifier with area-efficient PWM-residual-aliasing reduction
AU - Chien, Shih Hsiung
AU - Chen, Yi Wen
AU - Kuo, Tai Haur
N1 - Funding Information:
Manuscript received April 27, 2018; revised July 6, 2018 and September 6, 2018; accepted September 19, 2018. Date of publication October 26, 2018; date of current version December 21, 2018. This paper was approved by Guest Editor Yong-Ping Xu. This work was supported by the Ministry of Science and Technology of Taiwan. (Corresponding author: Tai-Haur Kuo.) The authors are with the Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan (e-mail: thkuo@ ee.ncku.edu.tw).
Publisher Copyright:
© 1966-2012 IEEE.
PY - 2018/12
Y1 - 2018/12
N2 - An area-efficient pulsewidth modulation (PWM)-residual-aliasing reduction technique is proposed for Class-D audio amplifiers by utilizing a low-complexity feed-forward path to cancel the PWM high-frequency components inside the feedback loop. The proposed technique reduces the PWM-residual-aliasing distortion without increasing the required switching frequency or power-hungry controller circuits, thereby lowering both the quiescent current and total harmonic distortion plus noise (THD+N) in Class-D audio amplifiers. Measurement results show that the proposed technique improves the THD+N of second-order Class-D amplifiers by 16.2 dB with a 1-kHz input; in addition, the Class-D amplifier of this paper achieves a minimum THD+N of 0.0032% while operating at a 215-kHz switching frequency, resulting in a reduction in quiescent current of more than 33%. Compared with other state of the arts, this paper implemented in 0.5-μm CMOS technology features a competitive THD+N while consuming the lowest quiescent current of 0.96 mA and occupying the smallest active area of 0.49 mm2.
AB - An area-efficient pulsewidth modulation (PWM)-residual-aliasing reduction technique is proposed for Class-D audio amplifiers by utilizing a low-complexity feed-forward path to cancel the PWM high-frequency components inside the feedback loop. The proposed technique reduces the PWM-residual-aliasing distortion without increasing the required switching frequency or power-hungry controller circuits, thereby lowering both the quiescent current and total harmonic distortion plus noise (THD+N) in Class-D audio amplifiers. Measurement results show that the proposed technique improves the THD+N of second-order Class-D amplifiers by 16.2 dB with a 1-kHz input; in addition, the Class-D amplifier of this paper achieves a minimum THD+N of 0.0032% while operating at a 215-kHz switching frequency, resulting in a reduction in quiescent current of more than 33%. Compared with other state of the arts, this paper implemented in 0.5-μm CMOS technology features a competitive THD+N while consuming the lowest quiescent current of 0.96 mA and occupying the smallest active area of 0.49 mm2.
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U2 - 10.1109/JSSC.2018.2873613
DO - 10.1109/JSSC.2018.2873613
M3 - Article
AN - SCOPUS:85055725902
VL - 53
SP - 3377
EP - 3385
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
SN - 0018-9200
IS - 12
M1 - 8510816
ER -