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Low-Noise, Low-EMI Switching Power Converters

Spur-Free Switching Power ConvertersSwitching power converters are highly desired in portable devices due to their high power conversion efficiency. However, the spurious switching noise and EMI they produce are quite problematic as they degrade the performance of noise-sensitive analog/RF circuits in these devices. As a result, low-noise but inefficient alternatives, such as linear power converters, are typically employed instead, leading to much higher overall power consumption.




This research is focused on developing switching schemes for switching power converters that produce a spur-free noise spectrum and low EMI in order to enable integrating them within noise-sensitive devices and achieving much higher power efficiency.

Related Publications:

  1. Chengwu Tao and Ayman Fayed, “PWM Control Architecture With Constant Cycle Frequency Hopping and Phase Chopping for Spur-Free Operation in Buck Regulators,” IEEE Transactions on VLSI, vol. 21, no. 9, pp. 1596-1607, Sept. 2013.

  2. Chengwu Tao and Ayman Fayed, “A Low-Noise PFM-Controlled Buck Converter for Low-Power applications,” IEEE Transactions on Circuits and Systems I, vol. 59, no. 12, pp. 3071-3080, Dec. 2012. Received the 2015 IEEE CAS Society Darlington Best Paper Award.

  3. Chengwu Tao and Ayman Fayed, “A GSM Power Amplifier Directly-Powered from a DC-DC Power Converter,” IEEE Microwave and Wireless Components Letters, vol. 22, no. 1, pp. 38-40, Jan. 2012.

  4. Chengwu Tao, and Ayman Fayed, “Spurious-Noise-Free Buck Regulator for direct-powering of Analog/RF loads using PWM Control with Random Frequency Hopping and Random Phase Chopping,” 2011 IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, Feb. 2011, pp. 396-397.

  5. Chengwu Tao and Ayman Fayed, “A Buck Converter with Reduced Output Spurs using Asynchronous Frequency Hopping,” IEEE Transactions on Circuits and Systems II, vol. 58, no. 11, pp. 709-713, Nov. 2011.

  6. Ayman Fayed, “Efficient Powering of RF PAs using DC-DC Power Supplies,” 2013 IEEE Compound Semiconductor IC Symposium (CSICS), Monterey, CA, Oct. 2013, pp. 1-4.

  7. Mina Nashed and Ayman Fayed, “Spur-Free Current-Mode Hysteretic Boost Converter for Noise-Sensitive Loads,” 2016 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), Abu Dhabi, UAE, Oct. 2016, pp. 93-96.

  8. Mina Nashed and Ayman Fayed, “Variable Switching Noise Mitigation in Hysteretic Power Converters using Spur-Free Control,” 2015 IEEE Applied Power Electronics Conference (APEC), Charlotte, North Carolina, Mar. 2015, pp. 410-413.

  9. W. Burkland, C. Tao, and A. Fayed, “Output Switching Noise Spectral Analysis and Modeling in Buck Regulators,” Microelectronics Journal, vol. 44, no. 5, pp. 373-381, Mar. 2013.

  10. Chengwu Tao, and Ayman Fayed, “Output Spectrum Analysis of Buck Converters in DCM with PFM Control,” 2012 IEEE Int. symposium on circuits and Systems (ISCAS), Seoul, South Korea, May 2012, pp. 2267-2270.

  11. Chengwu Tao, and Ayman Fayed, “Analysis and Modeling of Buck Converters Output Spectrum in CCM with PWM Control,” 2011 IEEE Midwest symposium on circuits and Systems (MWSCAS), Seoul, South Korea, Aug. 2011, pp. 1-4.

  12. Chengwu Tao, and Ayman Fayed, “Noise Spectrum Manipulation Techniques in Switching Power Converters for Analog and RF Loads,” 2011 Government Microcircuit Applications & Critical Technology Conference (GOMACTech), Orlando, Florida, Mar. 2011.

  13. Ayman Fayed and Chengwu Tao, “System and Method for Providing Power via a Spurious-Noise-Free Switching Device”, US Patent 8,901,905, granted Dec. 2014.