• Ph.D. in Electrical Engineering —Integrated Circuits Design, National Taipei University (NTPU), Taiwan, July 2022

• Masters of Science in Electrical Engineering –Integrated Circuits Design, National Taipei University (NTPU), Taiwan. June 2010

• Bachelor of Science in Electronics and Communications Engineering, MSU-Iligan Institute of Technology,  March 2006

• Power electronics

• AC-DC/DC-DC converters

• Renewable Energy 

• Digital Signal Processing

• FPGA  

• Embedded Systems Design

Google Scholar Page

1. Jayson S Abayan, Winston John F Astillero, Dennis Von G Itaas, Nieva M Mapula, Harreez M Villaruz, Gene Fe P Palencia, Rochelle M Sabarillo, Kevin O Maglinte, and Jefferson A Hora, "A 2μA Quiescent Current Output-Capacitorless LDO with Adaptive Power Transistors for Low Power Management in Energy Harvesting," in Proc. 2024 IEEE Region 10 Annual International Conf. (TENCON), Singapore, pp. 244-247.

2. Dale Matthew D Legaspi, Neil F Mora, Nieva M Mapula, Thesa L Vergara, Emrys Leowhel T Oling, Harreez M Villaruz, Gene Fe P Palencia, Rochelle M Sabarillo, and Kevin O Maglinte, "Dual Mode Output Capacitorless Low Dropout with Low Quiescent Current for Hearing Aid Applications," in Proc. 2024 IEEE Region 10 Annual International Conf. (TENCON), Singapore, pp. 794-797.

3. Jazzmyne Rona M Agustin, Harreez M Villaruz, Nieva M Mapula, and Gene Fe P Palencia, "High Speed Low Power Dynamic CMOS Comparator for SAR ADCs," in Proc. 2024 IEEE Region 10 Annual International Conf. (TENCON), Singapore, pp. 1121-1124.

4. Harreez M. Villaruz, Hong-Yi Huang, Nieva M. Mapula and Gene Fe P. Palencia, "Buck Converter with Variable Output Voltage for Dynamic Voltage Scaling (DVS) Applications," 2023 22nd International Symposium on Communications and Information Technologies (ISCIT), Sydney, Australia, pp. 375-380, Oct. 2023

5. Edwin C. Cuizon, Marven A. Yuson, Aileen B. Caberos, Nieva M. Mapula and Harreez M. Villaruz, "Design of Charge Pump for Low Power, Wide Range PLL in 65nm CMOS Technology," 2023 22nd International Symposium on Communications and Information Technologies (ISCIT), Sydney, Australia, pp. 1-5, Oct. 2023

6. Gil Michael E. Regalado, Jefferson A. Hora, Gene Fe P. Palencia, Harreez V. Quimque and Nieva M. Mapula, "Integration of OpenCV and Cyclone V Hybrid ARM and FPGA SoC for Face Detection Application," 2023 22nd International Symposium on Communications and Information Technologies (ISCIT), Sydney, Australia, pp. 1-5, 2023.

7. Hong-Yi Huang, Harreez M Villaruz, and Nieva M Mapula, "High-Efficiency Low-EMI Buck Converter Using Multistep PWL and PVT Insensitive Oscillator," IEEE Transactions on Power Electronics, vol. 37, no. 8, pp.9325-9332, Feb. 2022.

8. EM Matioza, Nieva M Mapula, Harreez M Villaruz, Ernesto E Empig, Alan T Vergara, Allenn C Lowaton, CM Bacus, EQ Mabala and JDB Ponce,  "Microcontroller-Based Monitoring System For Water Filtration,” in Proc. 8th AUN/SEED-Net Regional Conference on Electrical and Electronics Engineering, 2015.

9. Ernesto E Empig, Joel I Miano, Harreez M Villaruz, Nieva M Mapula, Allenn C Lowaton, Alan L Vergara, Danilo C Adlaon, Joseph Dale A Llanes, Jan Paul S Nicart, Carl Francis B Apresto, Aljay A Barola , (2015). “Microcontroller-Based Flood Warning System With Short Message Service Notifier,” in Proc. 8th AUN/SEED-Net Regional Conference on Electrical and Electronics Engineering, 2015.

10. Ernesto E Empig, Joel I Miano, Harreez M Villaruz, Nieva M Mapula, Alan L Vergara, Danilo C Adlaon, Glory Jean C Balansag, Marian May G Bayawa, Kathleen Mae C Echeveria, and Liezel G Villanueva, “Development Of Digital Human Body Trackier Alarm System Using Gps And Transceiver For Catastrophic Events'rescue Operation,” in Proc. 8th AUN/SEED-Net Regional Conference on Electrical and Electronics Engineering, 2015.

11. Ivan Ray T Lacanaria, Nieva M Mapula, Harreez M Villaruz, Ernesto E Empig, Joel I Miano, Carlo C Jacinto, Renalyn B Matalines, Jay Anthony M Inte, (2015). “Structured Monitoring Security System For Academe (SMSSA),” in Proc. 8th AUN/SEED-Net Regional Conference on Electrical and Electronics Engineering, 2015.

12. Jess Christopher B. Lopez and Harreez M. Villaruz, "Low-cost weather monitoring system with online logging and data visualization," in Proc. IEEE 8th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment and Management (HNICEM), Dec. 2015. 

13. Olga Joy L. Gerasta, Harrez M. Villaruz and Dominic O. Cagadas, “Design of 18-bit decimator for sigma-delta analog to digital converter with variable oversampling rate for audio application,” in Proc. IEEE 7th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management (HNICEM), Nov. 2014.

14. Alan L. Vergara, and Harreez M. Villaruz, "Development of an Arduino-based automated household utility power monitoring system," in Proc. IEEE 7th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management (HNICEM), Nov. 2014.

15. Harreez M. Villaruz, and Wan-Rone Liou, "Variable frequency DC/AC converter with EMI reduction,"  in Proc. IEEE 7th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management (HNICEM), Nov. 2014.

16. Wan-Rone Liou, Harreez M. Villaruz, Mei-Ling Yeh, and Patrick Roblin  ‘"Digitally controlled low-EMI SPWM generation method for inverter applications," IEEE Transactions on Industrial Informatics, vol. 10, no.1. pp. 73-83, Nov. 2014.