Circuit techniques to overcome Class-D audio amplifier limitations in mobile devices

Circuit techniques to overcome Class-D audio amplifier limitations in mobile devices

Circuit techniques to 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 4V achievable output voltage. Switching edge rate control enables the system to meet the EN55022 Class-B...

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Bibliographische Detailangaben
Hauptverfasser: Xicheng Jiang, Jungwoo Song, Minsheng Wang, Jianlong Chen, Arunachalam, S. K., Brooks, T. L.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Electromagnetic interference
Image edge detection
Noise
Pulse width modulation
Resistors
Switches
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Beschreibung
Zusammenfassung:Circuit techniques to 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 4V 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 over-limit current events.
ISSN:2158-5601
2158-5636
DOI:10.1109/VLSIC.2012.6243768