A phase-shift self-oscillating stereo class-D amplifier for battery-powered applications

Conference object English OPEN
Huffenus , Alexandre ; Pillonnet , Gaël ; Abouchi , Nacer ; Goutti , Frédéric ; Rabary , Vincent ; Specq , Cécile (2010)
  • Publisher: HAL CCSD
  • Related identifiers: doi: 10.1109/ISCAS.2010.5537458
  • Subject: [ SPI ] Engineering Sciences [physics]
    acm: Hardware_INTEGRATEDCIRCUITS

International audience; This paper presents a highly efficient stereo audio amplifier, based on a self-oscillating modulator. This modulation scheme has been analyzed and shows to have a higher bandwidth and error correction than standard Pulse Width Modulation (PWM). A practical implementation in CMOS 0.25um technology has been done to validate our theoretical and simulation results. Our amplifier demonstrated a Total Harmonic Distortion plus Noise (THD+N) as low as 0.07%, current consumption is 3.88mA at 3.6V (stereo) and the efficiency reaches 88% into 8Ohms. The integrated circuit measures 1.6x1.6mm and is able to work at supply voltages from 2.3V to 5.5V.
  • References (10)

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    [8] STMicroelectronics, TS4962M datasheet [9] Texas Instruments, TPA2012d2 datasheet

    [10] T. Piessens, M. Steyaert, “Oscillator Pulling and Synchronisation Issues in Self-Oscillating Class D Power Amplifiers”, Proceedings of the 29th European Solid-State Circuits Conference, pp. 529-532, Sept. 2003.

    [11] L. Soo-Hyoung et al., “A 2W, 92% efficiency and 0.01% THD+N class-D audio power amplifier for mobile applications, based on the novel SCOM architecture”, Proceedings of the IEEE Custom Integrated Circuits Conference, Oct. 2004.

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