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]

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)

    [1] J.D. Martin, “Theoretical efficiencies of Class-D Power Amplifiers”, Proc. IEE., Vol . 117, pp. 1089-1090, 1970.

    [2] J. Vanderkooy, “New Concepts in Pulse-Width Modulation”, presented at the 97th AES Convention, Preprint 3886, Nov. 1994.

    [3] K. Nielsen, “A Review and Comparison of Pulse Width Modulation (PWM) Methods for Analog and Digital Input Switching Power Amplifiers”, presented at the 102nd AES Convention, Preprint 4446, March 1997.

    [4] M. Berkhout, “Class-D Audio Amplifiers in Mobile Applications”, IEEE Internationnal Synopsium on Circuit and Systems, pp. 1169- 1172, May 2009.

    [5] G. Pillonnet, N. Abouchi, R. Cellier, A. Nagari, “A 0.01% THD, 70dB PSRR Single Ended Class D using variable hysteresis control for headphone amplifiers”, IEEE Internationnal Synopsium on Circuits and Systems, pp. 1181-1184, May 2009.

    [6] S. Poulsen, M.A.E. Andersen, “Hysteresis Controller with Constant Switching Frequency”, IEEE Transactions on Consumer Electronics, Vol. 51, Issue 2, pp. 688-693, May 2005.

    [7] B. Putzeys, “Globally Modulated Self-Oscillating Amplifier with Improved Linearity”, presented at the 37th AES Conference, Aug. 2009.

    [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.

  • Metrics
    views in OpenAIRE
    views in local repository
    downloads in local repository
Share - Bookmark