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Conference Paper
L. Zhang, Duvvuri, D., Bhattacharya, S., Dissanayake, A., Liu, X., Bishop, H. L., Zhang, Y., Blalock, T. N., Calhoun, B. H., and Bowers, S. M., “A -102dBm Sensitivity, 2.2µA Packet-Level-Duty-cycled Wake-Up Receiver with ADPLL achieving -30dB SIR”, in IEEE Custom Integrated Circuits Conference (CICC), 2023.
X. Liu, Kamineni, S., Breiholz, J., Calhoun, B. H., and Li, S., “A 194nW Energy-Performance-Aware IoT SoC Employing a 5.2nW 92.6% Peak Efficiency Power Management Unit for System Performance Scaling, Fast DVFS and Energy Minimization”, in IEEE International Solid-State Circuits Conference (ISSCC), 2022.PDF icon A 194nW Energy-Performance-Aware IoT SoC Employing a 5.2nW 92.6% Peak Efficiency Power Management Unit for System Performance Scaling, Fa.pdf (4.4 MB)
X. Liu, Chen, Z., Mim, N. Gahan, Agrawal, A., and Calhoun, B. H., “A 1pJ/Bit Bypass-SPI Interconnect Bus with I2C Conversion Capability and 2.3nW Standby Power for Fabric Sensing Networks”, in 2023 IEEE Biomedical Circuits and Systems Conference, 2023.PDF icon A 1pJbit Bypass-SPI Interconnect Bus with I2C Conversion Capability and 2.3nW Standby Power for Fabric Sensing Networks.pdf (2.54 MB)
S. Li, Liu, X., and Calhoun, B. H., “A 32nA Fully Autonomous Multi-Input Single-Inductor Multi-Output Energy Harvesting and Power Management Platform with 1.2×10^5 Dynamic Range, Integrated MPPT, and Multi-Modal Cold Start-Up”, in IEEE International Solid-State Circuits Conference (ISSCC), 2022.
X. Liu, Truesdell, D. S., Faruqe, O., Parameswaran, L., Rickley, M., Kopanski, A., Cantley, L., Coon, A., Bernasconi, M., Wang, T., and Calhoun, B. H., “A 33nW Fully Autonomous SoC with Distributed Cooperative Energy Harvesting and Multi-Chip Power Management for mm-scale System-in-Fiber”, in IEEE Transactions on Biomedical Circuits and Systems, Invited paper, 2023.PDF icon A_33nW_Fully_Autonomous_SoC_with_Distributed_Cooperative_Energy_Harvesting_and_Multi-Chip_Power_Management_for_mm-scale_System-in-Fiber.pdf (16.09 MB)
D. Duvvuri, Shen, X., Bassirian, P., Bishop, H. L., Liu, X., Chen, C. - H., Dissanayake, A., Zhang, Y., Blalock, T. N., Calhoun, B. H., and Bowers, S. M., “A 366 nW, -74.5 dBm Sensitivity Antenna-Coupled Wakeup Receiver at 4.9 GHz with Integrated Voltage Regulation and References”, in IEEE MTT-S International Microwave Symposium (IMS), Atlanta, GA, 2021.
X. Liu, Agrawal, A., Tanaka, A., and Calhoun, B. H., “A 6nA Fully-Autonomous Triple-Input Hybrid-Inductor-Capacitor Multi-Output Power Management System with Multi-Rail Energy Sharing, All-Rail Cold Startup, and Adaptive Conversion Control for mm-scale Distributed Systems”, in 2024 IEEE International Solid-State Circuits Conference (ISSCC), 2024.PDF icon A_6nA_Fully Autonomous_Triple-Input_Hybrid-Inductor-Capacitor_Multi-Output_Power_Management_System_with_Multi-Rail_Energy_Sharing_All-Rail_Cold_Startup_and_Adaptive_Conve.pdf (1.55 MB)
X. Liu, Li, S., and Calhoun, B. H., “An 802pW 93% Peak Efficiency Buck Converter with 5.5×106 Dynamic Range Featuring Fast DVFS and Asynchronous Load-Transient Control”, in 2021 IEEE European Solid-State Circuits Conference (ESSCIRC), 2021.PDF icon An 802pW 93% Peak Efficiency Buck Converter with 5.5×106 Dynamic Range Featuring Fast DVFS and Asynchronous Load-Transient Control.pdf (580.42 KB)
A. Tanaka, He, S., Mounesi, R., Liu, X., Faruqe, O., Mim, N. Gahan, Truesdell, D. S., Nasiri, A., and Calhoun, B. H., “An 81.0% Peak Efficiency, 1.0W/cm^3 Miniaturized 5V/1A AC-DC Converter using a Highly-Integrated Primary-Side Active Clamp Flyback Controller with Adaptive Frequency and Zero-Voltage Switching”, in 2025 IEEE Custom Integrated Circuits Conference (CICC), In Press.
S. Li, Liu, X., and Calhoun, B. H., “A 956pW Switched-Capacitor Sub-Bandgap Reference with 0.44-to-3.3V Supply Range, -67dB PSRR, and 0.2% within-Wafer Inaccuracy for Nanowatt IoT Systems”, in 2022 IEEE European Solid-State Circuits Conference (ESSCIRC), 2022.
A. Agrawal, Liu, X., Truesdell, D. S., and Calhoun, B. H., “Characterization of Stacked PV Cell Configurations in a Deep N-Well 65nm CMOS Technology”, in 2025 IEEE International Symposium on Circuits and Systems (ISCAS), In Press.
O. Faruqe, Le, P., Lee, D., Liu, X., Abdelatty, O., Truesdell, D. S., and Calhoun, B. H., “A Fully Integrated, Custom End-to-End PPG Sensing System for Ultra-Low Power Wearables”, in 2025 IEEE International Symposium on Circuits and Systems (ISCAS), In Press.
D. S. Truesdell, Liu, X., Breiholz, J., Gupta, S., Li, S., and Calhoun, B. H., “NanoWattch: A Self-Powered 3-nW RISC-V SoC Operable from 160mV Photovoltaic Input with Integrated Temperature Sensing and Adaptive Performance Scaling”, in 2022 IEEE Symposium on VLSI Circuits (VLSI), (Equally-Credited Authors), 2022.PDF icon NanoWattch A Self-Powered 3-nW RISC-V SoC Operable from 160mV Photovoltaic Input with Integrated Temperature Sensing and Adaptive Performance Scaling.pdf (11.11 MB)
X. Liu, Truesdell, D. S., Faruqe, O., Parameswaran, L., Rickley, M., Kopanski, A., Cantley, L., Coon, A., Bernasconi, M., Wang, T., and Calhoun, B. H., “A Self-Powered SoC with Distributed Cooperative Energy Harvesting and Multi-Chip Power Management for System-in-Fiber”, in IEEE International Solid-State Circuits Conference (ISSCC), 2023.PDF icon 15.1_A_Self-Powered_SoC_with_Distributed_Cooperative_Energy_Harvesting_and_Multi-Chip_Power_Management_for_System-in-Fiber.pdf (1.51 MB)
Journal Article
L. Zhang, Duvvuri, D., Bhattacharya, S., Dissanayake, A., Liu, X., Bishop, H. L., Zhang, Y., Blalock, T. N., Calhoun, B. H., and Bowers, S. M., “A -102 dBm Sensitivity Multi-Channel Heterodyne Wake-Up Receiver with Integrated ADPLL”, IEEE Open Journal of the Solid-State Circuits Society, 2024.
X. Shen, Duvvuri, D., Bassirian, P., Bishop, H. L., Liu, X., Dissanayake, A., Zhang, Y., Blalock, T. N., Calhoun, B. H., and Bowers, S. M., “A 184 nW, -78.3 dBm Sensitivity Antenna-Coupled Supply, Temperature, and Interference-Robust Wake-up Receiver at 4.9 GHz”, IEEE Transactions on Microwave Theory and Techniques, 2022.
P. Wang, Agarwala, R., Ownby, N., Liu, X., and Calhoun, B. H., “A 2.3-5.7μW Tri-Modal Self-Adaptive Photoplethysmography Sensor Interface IC for Heart Rate, SpO2 , and Pulse Transit Time Co-Monitoring”, IEEE Transactions on Biomedical Circuits and Systems, 2024.
X. Liu, Agrawal, A., Tanaka, A., and Calhoun, B. H., “Distributed Energy Harvesting and Power Management Units for Self-Powered In-Fabric Sensing Networks”, 2024 IEEE Midwest Symposium on Circuits and Systems (MWSCAS), invited paper, 2024.
X. Liu, Calhoun, B. H., and Li, S., “A Sub-nW 93% Peak Efficiency Buck Converter with Wide Dynamic Range, Fast DVFS, and Asynchronous Load-Transient Control”, IEEE Journal of Solid-State Circuits, (invited paper), 2022.PDF icon A SubnW 93 Peak Efficiency Buck Converter With Wide Dynamic Range Fast DVFS and Asynchronous Load Transient Control.pdf (3.94 MB)
X. Liu, Kamineni, S., Breiholz, J., Calhoun, B. H., and Li, S., “A Sub-µW Energy-Performance-Aware IoT SoC with a Triple-Mode Power Management Unit for System Performance Scaling, Fast DVFS, and Energy Minimization”, IEEE Journal of Solid-State Circuits, 2024.PDF icon A_Sub-_mu_W_Energy-Performance-Aware_IoT_SoC_With_a_Triple_Mode_Power_Management_Unit_for_System_Performance_Scaling_Fast_DVFS_and_Energy_Minimization.pdf (7.38 MB)