Paper Info
Title
5.2 An 8Ω 10W 91%-power-efficiency 0.0023%-THD+N multi-level Class-D audio amplifier with folded PWM
Abstract
As the portable device market tries to enhance user experience, high-power audio systems with boosted supply voltage have been the main design focus recently. Several past works have addressed issues related to boosted supply voltages [1,2]. Nevertheless, the power stage retained the classical H-bridge structure in the previous works, which resulted in aggravated electromagnetic interference (EMI) from high switching amplitude and poor efficiency due to voltage boosting. The use of multi-level pulse-width modulation (PWM) shown in Fig. 5.2.1 can naturally eliminate the complications caused by high supply voltages. Since the audio signal has a high crest factor, a multi-level Class-D amplifier draws most power directly from a low-voltage battery source, which in turn improves the power efficiency significantly [3]. Spread spectrum techniques prevent energy localization in the power spectral density [2]. Nevertheless, the diffusion of switching harmonics into the nearby frequencies complicates EMI management. However, the multi-level switching scheme suppresses EMI by reducing the switching amplitude without spreading the energy spectrum [4]. In this work, a new folded-PWM (FPWM) architecture implementing a multi-level H-bridge topology is presented.
Year
DOI
Venue
2017
10.1109/ISSCC.2017.7870274
2017 IEEE International Solid-State Circuits Conference (ISSCC)
Keywords
Field
DocType
multilevel class-D audio amplifier,folded PWM,portable device market,user experience enhancement,high-power audio systems,electromagnetic interference,multilevel pulse width modulation,audio signal,low-voltage battery source,power efficiency improvement,spread spectrum techniques,energy localization prevention,power spectral density,switching harmonics,EMI management,switching amplitude reduction,EMI suppression,FPWM architecture,multilevel H-bridge topology,resistance 8 ohm,power 10 W
Electrical efficiency,Audio signal,Computer science,Electromagnetic interference,Pulse-width modulation,Audio power amplifier,Electronic engineering,Crest factor,Electrical engineering,Switched-mode power supply,Amplifier
Conference
ISSN
ISBN
Citations 
2376-8606
978-1-5090-3759-9
0
PageRank 
References 
Authors
0.34
2
13
Name
Order
Citations
PageRank
Ji-Hun Lee153.92
Jun-suk Bang2114.24
Ki-Duk Kim33610.82
Hui-Dong Gwon4161.98
Sang-hui Park5204.57
Yeunhee Huh683.35
Kye-Seok Yoon752.12
Jong-Beom Baek832.59
Yong-Min Ju962.24
Gibbeum Lee1011.03
Homin Park11144.33
Hyeon-Min Bae1202.37
Gyu-Hyeong Cho1340176.39