# Journal & Conference Papers

**59.** S. B. Isukapati, H. Zhang, T Liu, E. Ashik, B. Lee, A. J. Morgan, W. Sung, A. Fayed, A. K. Agarwal, “Development of Isolated CMOS and HV MOSFET on an N-epi/P-epi/4H-SiC N+ Substrate for Power IC Applications,” *2021 IEEE 8th Workshop on Wide Bandgap Power Devices and Applications (WIPDA)*, Nov. 2021.

**58.** Tanner Tengberg and Ayman Fayed, “A Dual-Frequency Single-Inductor Single-Output DC-DC Converter Topology with Spur-Free Switching for Security Applications,” *2021* *IEEE Int. Midwest Symposium on Circuits and Systems (MWSCAS)*, East Lansing, Michigan, Aug. 2021, pp. 974-977.

**57.** T. Liu, H. Zhang, S. B. Isukapatiy, E. Ashik, A. J. Morgan, B. Lee, W. Sung, M. H. White, A. Fayed, and A. K. Agarwal, “SPICE Modeling and CMOS Circuit Development of a SiC Power IC Technology,” *2021 IEEE Int. Midwest Symposium on Circuits and Systems (MWSCAS)*, East Lansing, Michigan, Aug. 2021, pp. 966-969.

**56.** S. B. Isukapati, H. Zhang, T Liu, E. Ashik, B. Lee, A. J. Morgan, W. Sung, A. Fayed, A. K. Agarwal, “Monolithic Integration of Lateral HV Power MOSFET with LV CMOS for SiC Power IC Technology,” *2021 IEEE 33rd International Symposium on Power Semiconductor Devices and ICs (ISPSD)*, Nagoya, Japan, Jun. 2021, pp. 267-270. **Recipient of best poster presentation award**.

**55.** M. Singh and A. Fayed, “A 1-A 6-MHz Digitally-Assisted Buck-Boost Converter with Seamless Mode Transitions and Fast Dynamic Performance for Mobile Devices,” *IEEE Tran. on Power Electronics*, vol. 36, no. 4, pp. 4338-4351, Apr. 2021.

**54.** M. Singh and A. Fayed, “A 2-A 6-MHz Hysteretic Buck Converter with an 8-Bit Digital Jitter-Insensitive Frequency Correction Loop using Dual-Sided Hysteretic Band Modulation,” *2020 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)*, Springfield, MA, Aug. 2020, pp. 754-757.

**53.** M.S. Ahmed, W. Fu, R. Byrd, and A. Fayed, “A Spur-free, 150-mA Buck Regulator with 96.3% Peak-Efficiency and 77.2% Minimum Efficiency at 10-µA Load for Microcontrollers with Noise-Sensitive ADCs,” *2020 IEEE Applied Power Electronics Conf. (APEC)*, New Orleans, Louisiana, Mar. 2020, pp. 1298-1301.

**52.** M. S. Ahmed and A. Fayed, “A Current-Mode Delay-based Hysteretic Buck Regulator with Enhanced Efficiency at Ultra-light loads for Low-Power Microcontrollers,” *IEEE Transactions on Power Electronics*, vol. 35, no. 1, pp. 471-483, Jan. 2020.

**51.** M. Singh and A. Fayed, “Imbalanced High-Current Multi-Phase Buck Converters for High-Performance CPUs,” *2019 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)*, Dallas, Texas, Aug. 2019, pp. 929-932.

**50.** Y. Jiang, S. Asar, M. Ahmed, H. Zhang, and A. Fayed, “Output Control Techniques for Dual-Frequency SIMO Buck Converters,” *IEEE Transactions on Circuits & Systems I*, vol. 66, no. 10, pp. 4055-4067, Oct. 2019.

**49.** M. S. Ahmed and A. Fayed, “An All-Passive Emulated Ripple Control Technique For Constant-On-Time Buck Converters In CCM,” *2019 IEEE Int. symposium on circuits and Systems (ISCAS)*, Sapporo, Japan, May 2019.

**48.** S. Asar, H. Zhang, and A. Fayed, “Dual-Frequency SIMO Topologies for On-Chip Dynamic Power Supplies,” 2018 IEEE Power Supply on Chip Workshop (PWRSoC), Hsinchu, Taiwan, Oct. 2018. Poster.

**47.** M. Singh and A. Fayed, “An 8 A 100-MHz 4-Phase Buck Converter with Fast Dynamic Response and Enhanced Light-Load Efficiency,” *2018 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)*, Windsor, Canada, Aug. 2018, pp. 861-864.

**46.** Y. Jiang, S. Asar, and A. Fayed, “An Average Inductor Current Sensor with Enhanced Accuracy in DCM for Buck Converters,” *2018 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)*, Windsor, Canada, Aug. 2018, pp. 595-598.

**45.** Y. Jiang, M. Swilam, S. Asar, and A. Fayed, “An Accurate Sense-FET-based Inductor Current Sensor with Wide Sensing Range for Buck Converters,” *2018 IEEE Int. symposium on circuits and Systems (ISCAS), Florence*, Italy, May 2018, pp. 1-4.

**44.** M. Abdelfattah, M. Swilam, B. Dupaix, S. Smith, A. Fayed, and W. Khalil, “An On-Chip Resonant-Gate-Drive Switched-Capacitor Converter for NearThreshold Computing Achieving 70.2% Efficiency at 0.92A/mm2 Current Density and 0.4V Output,” *2018 IEEE International Solid-State Circuits Conference (ISSCC)*, San Francisco, CA, Feb. 2018, pp. 438-440.

**43.** 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*, vol. 33, no. 1, pp. 650-664, Jan. 2018.

**42.** Y. Jiang and A. Fayed, “A Buck Converter with Optimized Dynamic Response using Lag-Lead Active Voltage Positioning,” *2017 IEEE Int. Midwest Symposium on Circuits and Systems (MWSCAS)*, Boston, Massachusetts, Aug. 2017, pp. 440-443.

**41.** M. Swilam, A. Naguib, B. Dupaix, W. Khalil, and A. Fayed, “A Calibration-Free Low-Power Supply-Pushing Reduction Circuit (SPRC) for LC VCOs,” *2017 IEEE Int. symposium on circuits and Systems (ISCAS)*, Baltimore, Maryland, May 2017, pp. 1-4.

**40.** 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.

**39.** 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.

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

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

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

**35.** 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*.*

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

**33.** 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.

**32.** 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*.*

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

**30.** 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*.*

**29.** 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.

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

**27.** 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 Int. Midwest symposium on circuits and Systems (MWSCAS)*, College Station, Texas, Aug. 2014, pp. 603-606.

**26.** 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.

**25.** 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.

**24.** 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.

**23.** 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.

**22.** 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.

**20.** 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.

**19.** 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.**

**18.** 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.

**17.** 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.

**16.** 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.

**15.** 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.

**14.** 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.** 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*.*

**12.** 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.

**11.** 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.

**10.** 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.

**9.** 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.

**8.** 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.

**7.** 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.

**6.** 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.

**5.** 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.

**4.** 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.

**3.** 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.

**2.** 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.

**1.** 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.