J. Semicond. > 2011, Volume 32 > Issue 7 > 075004

SEMICONDUCTOR INTEGRATED CIRCUITS

A low noise high efficiency buck DC–DC converter with sigma–delta modulation

Cai Shujiang, Pi Changming, Yan Wei and Li Wenhong

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DOI: 10.1088/1674-4926/32/7/075004

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Abstract: Some research efforts to improve the efficiency and noise performance of buck DC–DC converters are explored. A carefully designed power MOSFET driver, including a dead time controller, discontinuous current mode (DCM) controller and gate width controller, is proposed to improve efficiency. Instead of PWM modulation, sigma–delta modulation is introduced into the feedback loop of the converter to move out the clock-referred harmonic spike. The proposed converter has been designed and fabricated by a 0.35 μm CMOS process. Measured results show that the peak efficiency of the converter can reach 93% and sigma–delta modulation suppresses the harmonic spike by 30 dB over PWM modulation.

Key words: buck DC–DC converterPWM modulationsigma–delta modulationDCMdead time controlwidth controlcurrent sensing

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    Cai Shujiang, Pi Changming, Yan Wei, Li Wenhong. A low noise high efficiency buck DC–DC converter with sigma–delta modulation[J]. Journal of Semiconductors, 2011, 32(7): 075004. doi: 10.1088/1674-4926/32/7/075004
    Cai S J, Pi C M, Yan W, Li W H. A low noise high efficiency buck DC–DC converter with sigma–delta modulation[J]. J. Semicond., 2011, 32(7): 075004. doi: 10.1088/1674-4926/32/7/075004.
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    Received: 18 August 2015 Revised: 24 February 2011 Online: Published: 01 July 2011

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      Cai Shujiang, Pi Changming, Yan Wei, Li Wenhong. A low noise high efficiency buck DC–DC converter with sigma–delta modulation[J]. Journal of Semiconductors, 2011, 32(7): 075004. doi: 10.1088/1674-4926/32/7/075004 ****Cai S J, Pi C M, Yan W, Li W H. A low noise high efficiency buck DC–DC converter with sigma–delta modulation[J]. J. Semicond., 2011, 32(7): 075004. doi: 10.1088/1674-4926/32/7/075004.
      Citation:
      Cai Shujiang, Pi Changming, Yan Wei, Li Wenhong. A low noise high efficiency buck DC–DC converter with sigma–delta modulation[J]. Journal of Semiconductors, 2011, 32(7): 075004. doi: 10.1088/1674-4926/32/7/075004 ****
      Cai S J, Pi C M, Yan W, Li W H. A low noise high efficiency buck DC–DC converter with sigma–delta modulation[J]. J. Semicond., 2011, 32(7): 075004. doi: 10.1088/1674-4926/32/7/075004.

      A low noise high efficiency buck DC–DC converter with sigma–delta modulation

      DOI: 10.1088/1674-4926/32/7/075004
      • Received Date: 2015-08-18
      • Accepted Date: 2010-11-15
      • Revised Date: 2011-02-24
      • Published Date: 2011-06-22

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