Integrated Pop-Click Noise Suppression, EMI Reduction, and Short-Circuit Detection for Class-D Audio Amplifiers

Circuit techniques that overcome practical noise, reliability, and EMI limitations are reported. An auxiliary loop with ramping circuits suppresses pop-and-click noise to 1 mV for an amplifier with 4 V-achievable output voltage. Switching edge rate control enables the system to meet the EN55022 Clas...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2013-04, Vol.48 (4), p.1099-1108
Main Authors: Xicheng Jiang, Jungwoo Song, Minsheng Wang, Jianlong Chen, Arunachalam, S. K.
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Audio class-D amplifier
auxiliary driver
auxiliary loop
Batteries
Circuit properties
Electric, optical and optoelectronic circuits
electromagnetic compatibility
Electromagnetic interference
Electronic circuits
Electronics
Exact sciences and technology
Logic gates
Noise
pop-and-click noise
Pulse width modulation
ramping circuit
Resistors
short-circuit detection
Switches
switching edge rate control
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Summary:Circuit techniques that overcome practical noise, reliability, and EMI limitations are reported. An auxiliary loop with ramping circuits suppresses pop-and-click noise to 1 mV for an amplifier with 4 V-achievable output voltage. Switching edge rate control enables the system to meet the EN55022 Class-B standard with a 15 dB margin. An enhanced scheme detects short-circuit conditions without relying on overlimit current events.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2013.2238999