Volume 35 Issue 5
May  2009
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Feng Wei, Li Hongge, Zhang Youguanget al. Novel chaotic frequency modulation circuit for class-D amplifier[J]. Journal of Beijing University of Aeronautics and Astronautics, 2009, 35(5): 559-562. (in Chinese)
Citation: Feng Wei, Li Hongge, Zhang Youguanget al. Novel chaotic frequency modulation circuit for class-D amplifier[J]. Journal of Beijing University of Aeronautics and Astronautics, 2009, 35(5): 559-562. (in Chinese)

Novel chaotic frequency modulation circuit for class-D amplifier

  • Received Date: 10 Aug 2008
  • Publish Date: 31 May 2009
  • The easy to be integrated chaotic frequency modulation circuit for class-D amplifier was proposed to solve electromagnetic interference(EMI) issue. In the circuit, an improved chaotic sequence generator was designed and its chaotic behavior was modeled by stroboscopic map. The proposed circuit only replaced fixed frequency ramp generator in conventional class-D amplifier architecture. Therefore, the spread spectrum triangular wave modulated by chaotic sequence was employed as carrier wave of pulse width modulation(PWM), instead of fixed frequency triangular wave. The circuit was designed, verified and implemented using 0.35μm CMOS process. Simulation results show that the peak power reduction can achieve to 15dB.

     

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  • [1] Yasuda A, Kimura T, Ochiai K, et al. A class-D amplifier using a spectrum shaping technique Proceedings of the IEEE Custom Integrated Circuits Conference. Florida: IEEE Press, 2004:173-176 [2] Kousaka T, Kido T, Ueta T, et al. Analysis of border-collision bifurcation in a simple circuit IEEE International Symposium on Circuits and Systems. Geneva: IEEE Press, 2000, 2:481-484 [3] Mukherjee R, Nandi S, Banerjee S. Reduction in spectral peaks of DC-DC converters using chaos-modulated clock IEEE International Symposium on Circuits and Systems. Kobe: IEEE Press, 2005, 4:3367-3370 [4] Setti G, Balestra M, Rovatti R. Experimental verification of enhanced electromagnetic compatibility in chaotic FM clock signals IEEE International Symposium on Circuits and Systems. Geneva: IEEE Press, 2000, 3:229-232 [5] Tse C K. Complex behavior in switching power converters [M]. New York: CRC Press, 2003 [6] Banerjee S, Karthik M S, Yuan G H, et al. Bifurcations in one dimensional piecewise smooth maps-theory and applications in switching circuits [J]. IEEE Trans on Circuits and Systems: Fundamental Theory and Applications, 2000, 47(3):389-394
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