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Journal & Conference Papers

  1. Mina Nashed and Ayman Fayed, “A Current-Mode Hysteretic Buck Converter with Spur-Free Control for Variable Switching Noise Mitigation,” IEEE Transactions on Power Electronics, Available on IEEE Xplore Early Access.

  2. Ahmed Abdelmoaty, Mohammad Al. Shyoukh, Y.C. Hsu, and Ayman Fayed, “A MPPT Circuit with 25 μW Power Consumption and 98.7% Tracking Efficiency for PV Systems,” IEEE Transactions on Circuits & Systems I, vol. 64, no. 2, pp. 272-282, Feb. 2017.

  3. Yongjie Jiang and Ayman Fayed, “A 1A, Dual-Inductor 4-Output Buck Converter with 20-MHz/100-MHz Dual-Frequency Switching and Integrated Output Filters in 65nm CMOS,” IEEE Journal of Solid-State Circuits, vol. 51, no. 10, pp. 2485-2500, Oct. 2016.

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

  5. Ahmed Abdelmoaty and Ayman Fayed, “Power Loss Analysis in Single-Step, Single-Inductor Energy-Harvesting-based Power Supplies,” 2016 IEEE Midwest Symposium on Circuits and Systems (MWSCAS), Abu Dhabi, UAE, Oct. 2016, pp. 297-300.

  6. Bora Tar and Ayman Fayed, “An Overview of the Fundamentals of Battery Chargers,” 2016 IEEE Midwest Symposium on Circuits and Systems (MWSCAS), Abu Dhabi, UAE, Oct. 2016, pp. 437-440.

  7. Ahmed Abdelmoaty, Mohammad Al-Shyoukh, and Ayman Fayed, “A High-Voltage Level Shifter with Sub-Nano-Second Propagation Delay for Switching Power Converters,” 2016 IEEE Applied Power Electronics Conference (APEC), Long Beach, California, Mar. 2016, pp. 2437-2440.

  8. Wei Fu, M. Radhakrishnan, S. T. Tan, R. Byrd and Ayman Fayed, “A DCM-only Buck Regulator with Hysteretic-Assisted Adaptive Minimum Constant On-time Control for Low-Power Microcontrollers,” IEEE Transactions on Power Electronics, vol. 31, no. 1, pp. 418-429, Jan. 2016.

  9. Chih-Wei Chen and Ayman Fayed, “A Low-Power Dual-Frequency SIMO Buck Converter Topology with Fully-Integrated Outputs and Fast Dynamic Operation in 45-nm CMOS,” IEEE Journal of Solid-State Circuits, vol. 50, no. 9, pp. 2161-2173, Sept. 2015.

  10. Yongjie Jiang and Ayman Fayed, “A 1A, 20MHz/100MHz Dual-Inductor 4-Output Buck Converter with Fully-Integrated Bond-Wire-Based Output Filters for Ripple Reduction,” 2015 IEEE Custom Integrated Circuits Conference (CICC), San Jose, California, Sept. 2015, pp. 1-4.

  11. Yongjie Jiang and Ayman Fayed, “On-Chip Input and Ground Ringing Suppression in High-Frequency Buck Converters,” 2015 Midwest Symposium on Circuits and Systems (MWSCAS), Fort Collins, Colorado, Aug. 2015, pp. 1-4.

  12. 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.

  13. Ahmed Abdelmoaty and Ayman Fayed, “A Single-Step, Single-Inductor Energy-Harvesting-based Power Supply Platform with a Regulated Battery Charger for Mobile Applications,” 2015 IEEE Applied Power Electronics Conference (APEC), Charlotte, North Carolina, Mar. 2015, pp. 666-669.

  14. Wei Fu and Ayman Fayed, “A Self-Regulated 588 MHz Buck Regulator with On-chip Passives and Circuit Stuffing in 65nm,” 2014 IEEE Midwest Symposium on Circuits and Systems (MWSCAS), College Station, Texas, Aug. 2014, pp. 338-341Recipient of best student paper award (shared with other papers).

  15. Mohamed El Mahalawy, Neven Misljenovic, and Ayman Fayed, “A Load-Pull Approach Using Multi-Frequency Harmonic Tuners for Enhancing PAE and Device Model Accuracy,” 2014 IEEE Midwest symposium on circuits and Systems (MWSCAS), College Station, Texas, Aug. 2014, pp. 603-606.

  16. Mohamed El Mahalawy, Scott Patten, Don Landt, Robert Ward, Andy Walker, and Ayman Fayed, “An All-GaN Differential Driver for a 60 V GaN-Based Power Amplifier with 1 GHz Switching Frequency,” 2014 IEEE Wireless and Microwave Technology Conference (WAMICON), Tampa, Florida, Jun. 2014, pp. 1-3.

  17. Wei Fu and Ayman Fayed, “Power Conversion Schemes in Mixed-Signal SoCs,” 2014 IEEE Int. symposium on circuits and Systems (ISCAS), Melbourne VIC, Australia, Jun. 2014, pp. 606-609.

  18. Chih-Wei Chen, Jeffrey Morroni, David Anderson, and Ayman Fayed, “Dual-Frequency SIMO Power Converters for Low-Power on-Chip Power Grids in SoCs,” 2014 IEEE Applied Power Electronics Conference (APEC), Fort Worth, Texas, Mar. 2014, pp. 1954-1957.

  19. 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.

  20. Chengwu Tao and Ayman Fayed, “PWM Control Architecture for Spur-Free Operation in Buck Regulators,” IEEE Transactions on VLSI, vol. 21, no. 9, pp. 1596-1607, Sept. 2013.

  21. Wei Fu, Siang Tan Tong, and Ayman Fayed, “Switching and Conduction Loss Analysis of Buck Converters Operating in DCM-only Scenarios,” 2013 IEEE Int. symposium on circuits and Systems (ISCAS), Beijing, China, May 2013, pp. 921-924.

  22. 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.

  23. 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.

  24. 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.

  25. 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. 

  26. 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.

  27. 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.

  28. 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.

  29. 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.

  30. Yogesh K. Ramadass, Ayman A. Fayed, and Anantha P. Chandrakasan, “A Fully-Integrated Switched-Capacitor Step-Down DC-DC Converter With Digital Capacitance Modulation in 45 nm CMOS,” IEEE Journal of Solid-State Circuits, vol. 45, no. 12, pp. 2557-2565, Dec. 2010.

  31. Oguz Altun, Ayman Fayed, Russell Byrd, Rahmi Hezar, Gaurav Chandra, and Gabriel Gomez, “A 6mW 480MHz Continuous Time SD Modulator with 65dB DR over 5MHz Bandwidth in 65nm CMOS,” 2010 IEEE Int. symposium on circuits and Systems (ISCAS), Paris, France, Jun. 2010, pp. 3989-3992.

  32. Ayman Fayed, Russell Byrd, and Baher Haroun, “An adaptive high-voltage protection and common-mode adjustment circuit for passive-active continuous-time sigma-delta ADCs,” Journal of Analog Integrated Circuits and Signal Processing, vol. 62, no. 2, pp. 159-166, Feb. 2010.

  33. Yogesh K. Ramadass, Ayman A. Fayed, Baher Haroun, and Anantha P. Chandrakasan, “A 0.16mm2 Completely On-Chip Switched-Capacitor DC-DC Converter using Digital Capacitance Modulation for LDO Replacement in 45nm CMOS,” 2010 IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, Feb. 2010, pp. 209-210,209a.

  34. Wei Fu, and Ayman Fayed, “A Feasibility Study of High-Frequency Buck Regulators in Nanometer CMOS Technologies,” 2009 IEEE Dallas circuits & Systems Workshop (DCAS), Dallas, Texas, Oct. 2009, pp. 31-34.

  35. Ayman Fayed, “Level shifting techniques for Mixed-Signal SoCs in low-voltage nanometer CMOS technologies,” 2009 IEEE Midwest Symposium on Circuits and Systems (MWSCAS), Cancun, Mexico, Aug. 2009, pp. 1102-1105.

  36. Ayman Fayed, M. Ismail, “A Low-Voltage, Low-Power CMOS Analog Adaptive Equalizer for UTP-5 Cables,” IEEE Transactions on Circuits and Systems I, vol. 55, no. 2, pp. 480-495, March 2008.

  37. Ayman Fayed, M. Ismail, “A 3.7mW, 1.6V CMOS Analog Adaptive Equalizer for a 125Mbps Wire-Line Transceiver,” 2007 IEEE Int. symposium on circuits and Systems (ISCAS), New Orleans, LA, May 2007, pp. 2136-2139.

  38. Ayman A. Fayed, and M. Ismail “A Digital Calibration Algorithm for implementing accurate On Chip Resistors,” International Journal of Analog Integrated Circuits and Signal Processing, vol. 47, no. 3, pp. 259-272, June 2006.

  39. Ayman Fayed, M. Ismail, “A Low-Voltage, Highly-Linear, Voltage-Controlled Transconductor,” IEEE Transactions on Circuits and Systems II, vol. 52, no. 12, pp. 831-835, Dec. 2005.

  40. Ayman A. Fayed, and M. Ismail “A Digital Tuning Algorithm for On-Chip Resistors,” 2004 IEEE Int. symposium on circuits and Systems (ISCAS), Vancouver BC, Canada, May 2004, pp. 936-939.

  41. Ayman A. Fayed, and M. Ismail “A High Speed, Low Voltage CMOS Offset Comparator,” International Journal of Analog Integrated Circuits and Signal Processing, vol. 36, no. 3, pp. 267-272, Sept. 2003.