Research Interest:
• Low Voltage DC-DC power management circuits
• Analog Circuits Click here for My Google Scholar Page_
• Ultra low power Circuits
• Circuits with Emerging Devices
Invited Talk:
• Khondker Zakir Ahmed, “Low Voltage Energy Harvesting: Prospects, Challenges and Design Techniques”, Cirrus Logic, Austin, TX. Feb. 2014 [Click here for Visual, PDF]
Patent:
• Harish Krishnamurthy, Khondker Z. Ahmed, and Krishnan Ravichandran “Smart Power Delivery Network”, Patent Granted, Filed on Dec. 23, 2014 by Intel Corporation. Publication date: Jun 23, 2016 [USPTO application link] Grant Number/Date: 09882383/Jan 30, 2018 [USPTO Link]
Journal Articles:
2015
J7. Monodeep Kar, Khondker Z. Ahmed, and Saibal Mukhopadhyay, "A Scalable Hybrid RegulatorFor Down Conversion of High Input Voltage Using Low Voltage Devices," IEEE Transactions on Power Electronics (Letters), vol.31, no.3, pp.1857-1862, Mar. 2016.
J6. Khondker Z. Ahmed, and Saibal Mukhopadhyay, "A 190nA Bias Current 10mV Input Multi-Stage Boost Regulator with Intermediate Node Control to Supply RF Blocks in Self-powered Wireless Sensors," IEEE Transactions on Power Electronics, vol., no., pp., April. 2015.
J5. Amit R. Trivedi, Khondker Z. Ahmed, and Saibal Mukhopadhyay, "Negative Gate Transconductance in Gate/Source Overlapped Heterojunction Tunnel FET and application to Single Transistor Phase Encoder," IEEE Electron Device Letters, vol.36, no.2, pp.201,203, Feb. 2015.
2014
J4. Khondker Z. Ahmed, and Saibal Mukhopadhyay, "A wide conversion ratio, extended input 3.5μA Boost Regulator with 82% Efficiency for Low Voltage Energy Harvesting," IEEE Transactions on Power Electronics vol. 29, no. 9, pp. 4776-4786, Sept. 2014.
J3. Minki Cho, Khondker Z. Ahmed, William Song, Sudhakar Yalamanchili, and Saibal Mukhopadhyay, “Post-Silicon Characterization and On-line Prediction of Transient Thermal Field in Integrated Circuits using Thermal System Identification” in IEEE Transactions on Components, Packaging and Manufacturing Technology, vol.4, no.1, pp.37,45, Jan. 2014.
2012
J2. Khondker Z. Ahmed, Syed Mustafa Khelat Bari, Didar Islam and A. B. M. Harun-ur Rashid, “Design and Implementation of PFM Mode High Efficiency Boost Regulator”. Journal of Analog Integrated Circuits and Signal Processing, Vol. 71, Issue 3, pp 349-358, Jun. 2012.
2011
J1. Mohiuddin Hafiz, Khondker Z. Ahmed, and A. B. M. Harun-ur Rashid, “Design and implementation of a 0.8V input, 84% duty cycle, variable frequency step-up converter”. Microelectronics Journal. Vol. 42, Issue 5, pp. 648-660, May 2011.
Conference articles: (Oral Presentations by Khondker Z. Ahmed in the respective conferences are marked by ‘ * ’)
2016
(Invited Paper) K. Z. Ahmed, M. Kar, and S. Mukhopadhyay, "Energy delivery for self-powered IoT devices," in 2016 21st Asia and South Pacific Design Automation Conference (ASP-DAC), Jan. 2016.
S. Mueller, K. Z. Ahmed, A. Singh, S. Mukhopadyay, M. Swaminathan, Y. Wang, J. Wong, S. Bharathi, Y. Mano, H. Moghadam and D. Draper " Design of High Efficiency Integrated Voltage Regulators with Embedded Magnetic Core Inductors" in 66th Electronic Components and Technology Conference (ECTC), June 2016.
2015
K. Z. Ahmed, and Saibal Mukhopadhyay, “A 120x Conversion Ratio 140nA Bias Current 25mV Input Boost Regulator for Energy Harvesting Applications” in SRC TECHCON 2015, Sept. 2015.
M. Kar, K. Z. Ahmed, and S. Mukhopadhyay, “A Scalable Hybrid Regulator for Down Conversion of High Input Voltage Using Low Voltage Devices” in SRC TECHCON 2015, Sept 2015. [Best in Session award winner.]
2014
• * Khondker Z. Ahmed, and Saibal Mukhopadhyay, “Multi-Domain Power Delivery System for Microwatt Wireless Sensor Networks” SRC TECHCON 2014, Sept. 2014. [Best in Session award winner]
• Borislav Alexandrov, Khondker Z. Ahmed, and Saibal Mukhopadhyay, “An On-Chip Autonomous Thermoelectric Energy Management System for Energy-Efficient Active Cooling” ISLPED Aug. 2014. [Best Paper award winner]
• * SwarrnnaKarthik Pathasarathy, Khondker Z. Ahmed, Borislav Alexandrov, Satish Kumar, and Saibal Mukhopadhyay, “Energy Efficient Active Cooling of Integrated Circuits Using Autonomous Peltier/Seebeck Mode Switching of a Thermoelectric Module,” 2014 30th Annual IEEE Semiconductor Thermal Measurement and Management Symposium (SEMI-THERM), March 2014
• Wen Yueh, Khondker Z. Ahmed, and Saibal Mukhopadhyay, “Field Programmable Thermal Emulator (FPTE): An All-Silicon Test Structure for Thermal Characterization of Integrated Circuits” 2014 30th Annual IEEE Semiconductor Thermal Measurement and Management Symposium (SEMI-THERM), March 2014. [Honorable Mention, Top four papers]
2013
• * Khondker Z. Ahmed, and Saibal Mukhopadhyay “A 110nA Synchronous Boost Regulator with Autonomous Bias Gating for Energy Harvesting” IEEE Custom Integrated Circuits Conference (CICC), Sept. 2013.
2012
• Minki Cho, Muhammad Khellah, Kwanyeob Chae, Khondker Z. Ahmed, James W. Tschanz, Saibal Mukhopadhyay, "Characterization of Inverse Temperature Dependence in logic circuits," IEEE Custom Integrated Circuits Conference (CICC), pp.1-4, Sept. 2012.
2010
• * Khondker Zakir Ahmed, Muhammad Shahidul Islam, Syed Mustafa Khelat Bari, M. R. R. Mazumder and A. B. M. H. Rashid, "Design of a linearly increasing inrush current limit circuit for DC-DC boost regulators" IEEE APCCAS-2010, Dec 06-09, 2010, Kuala Lumpur, Malaysia.
• * Syed Mustafa Khelat Bari, Didar Islam and Khondker Zakir Ahmed, "Implementation of Highly Accurate NMOS VTH Based Clamping Technique in Low Current Comparator" IEEE APCCAS-2010, Dec 06-09, 2010, KualaLumpur, Malaysia.
• * Khondker Zakir Ahmed, Syed Mustafa Khelat Bari, Didar Islam and A. B. M. H. Rashid, "Design and Implementation of Ultra Low Bias Current High Efficiency PFM Mode DC-DC Boost Regulator" ICECE 2010, Dec 18-20, 2010, Dhaka, Bangladesh.
• M. Zaved Parvez, Khondker Z. Ahmed, Quazi. R. Mahfuz, and M. Saifur Rahman, "A theoretical model of GSM network based vehicle tracking system," 2010 International Conference on Electrical and Computer Engineering (ICECE), vol., no., pp.594,597, 18-20 Dec. 2010
2008
• Khondker Zakir Ahmed and Didar Islam, "A simple ESR measurement technique for capacitors using switching DC- DC booster" pp. 263-266, IEEE AUTOTESTCON 2008, Sep 8-11, Salt Lake City, Utah, USA.
• * Khondker Zakir Ahmed, Mustafa Ryadh, Syed Mustafa Khelat Bari and Didar Islam, "Design and implementation of semi-quadratic slope compensation circuit for PWM peak current mode boost regulator" ICECE 2008, pp. 512-515, Dec 20-22, Dhaka, Bangladesh.
• * Khondker Zakir Ahmed, Moakkharul Islam, Mustafa Ryadh, Didar Islam, Mohiuddin Hafiz and Q. D. M. Khosru, "Analysis of efficiency optimization for PFM mode DC-DC boost regulator" ICECE 2008, pp. 195-198, Dec 20-22, Dhaka, Bangladesh.
• Mustafa Ryadh, Khondker Zakir Ahmed, Mohiuddin Hafiz and A. B. M. H. Rashid, "An improved method of highly accurate supply detection using bandgap reference circuit and its implementation in a pseudo BiCMOS process" ICECE 2008, pp. 311-314, Dec 20-22, Dhaka, Bangladesh.
2004
• * Asif Imran Khan Choudhury, Md. Riazur Rahman Mazumder, Khondker Zakir Ahmed and Q. D. M. Khosru, "Explanation for reduced Fowler-Nordheim tunneling current in ultra-thin silicon nitride gate dielectric in MOSFETs " ICECE 2004, pp. 271-274, Dec 28-30, Dhaka, Bangladesh.