Low Voltage Switched-Capacitive-Based Reconfigurable Charge Pumps for Energy Harvesting Systems: An Overview

Ho, Tian Siang; Ramiah, Harikrishnan; Churchill, Kishore Kumar Pakkirisami; Chen, Yong; Lim, Chee Cheow; Lai, Nai Shyan; Mak, Pui-In; Martins, Rui P.

doi:10.1109/access.2022.3226783

Cited by 12 publications

(1 citation statement)

References 105 publications

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“…A ring voltage-controlled oscillator (RVCO) is a key block in the clock generation unit in the CP scheme to generate an oscillating clock signal [35], [36], [37], [38]. The generated oscillating frequency is dependent on the number of inverter cells and the delay time, as shown in the equation below [39] and [40]:…”

Section: Clock Generation a Voltage-controlled Ring Oscillatormentioning

confidence: 99%

A Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application

Kee,

Ramiah,

Churchill

et al. 2023

IEEE Access

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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 permit 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.INDEX TERMS Reconfigurable charge pump (CP), ring-voltage controlled oscillator (RVCO), dc-to-dc converter, low power energy harvesting, CMOS, power conversion efficiency (PCE).

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Section: Clock Generation a Voltage-controlled Ring Oscillatormentioning

confidence: 99%

A Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application

Kee,

Ramiah,

Churchill

et al. 2023

IEEE Access

Self Cite

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A high‐PCE amalgamate charge pump topology with extended input voltage dynamic range for energy harvesting systems

Yong,

Zhou,

et al. 2024

Circuit Theory & Apps

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This paper presents a novel extended input voltage dynamic range (IVDR) amalgamate charge pump (CP) for energy harvesting systems. The proposed amalgamate CP adaptively switches its charge transfer transistor into switch and diode connection based on the input voltage, effectively enhancing the power conversion efficiency (PCE) over a wide input voltage range. Implemented in 65 nm CMOS technology, the post‐layout results demonstrate a PCE exceeding 40% within the input voltage range of 0.36–0.85 V, under 60 kΩ load. The design achieves an extended IVDR of 0.49 V with a peak PCE of 50.02% observed at an input voltage of 0.45 V. The proposed amalgamate CP design features two distinct charge transfer transistor connections, leveraging the strength of Dickson CP with low reversion loss in high input voltage range and the low conduction loss of cross‐coupled CP (CCCP) in low input voltage range, thereby extending the input voltage operation range of conventional CP.

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Variants and Evolutions of the Dickson CP Topology

Ballo,

Dario Grasso,

Palumbo

2023

High-Performance Integrated Charge Pumps

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Low Voltage Switched-Capacitive-Based Reconfigurable Charge Pumps for Energy Harvesting Systems: An Overview

Cited by 12 publications

References 105 publications

A Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application

A Subthreshold Operation Series-Parallel Charge Pump Incorporating Dynamic Source-Fed Oscillator for Wide-Input-Voltage Energy Harvesting Application

A high‐PCE amalgamate charge pump topology with extended input voltage dynamic range for energy harvesting systems

Variants and Evolutions of the Dickson CP Topology

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