Open AccessA Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application
Author(s) -
Yong Jack Kee,
Harikrishnan Ramiah,
Kishore Kumar Pakkirisami Churchill,
Gabriel Chong,
Saad Mekhilef,
Nai Shyan Lai,
Yong Chen,
Pui-In Mak,
Rui P. Martins
Publication year - 2023
Publication title -
ieee access
Language(s) - English
Resource type - Journals
ISSN - 2169-3536
DOI - 10.1109/access.2023.3312727
Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation
This work proposes a CMOS reconfigurable charge pump (CP) for a low-voltage energy harvesting system. It utilizes the low effective resistance from the parallel CP to enhance its power conversion efficiency (PCE). The CP exhibits an adaptive configuration with different stages depending on the input voltage, changing its voltage conversion ratio (VCR) to limit the output voltage under 1.8 V. Additionally, this work develops a novel dynamic source-fed oscillator that modulates the oscillating frequency by utilizing a dynamic source for the ring-voltage controlled oscillator (RVCO). The independent source from the RVCO and the clock-generating units from the proposed technique permits the implementation of frequency modulation without affecting the clock amplitude. Fabricated in 65-nm CMOS, the proposed prototype measures 62% peak PCE with an input voltage range of 0.26 V to 0.64 V.