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Prototyping of an All-pMOS-Based Cross-Coupled Voltage Multiplier in Single-Well CMOS Technology for Energy Harvesting Utilizing a Gastric Acid Battery

1
Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
2
Micro System Integration Center, Tohoku University, Sendai 980-8579, Japan
3
Promotion Office of Strategic Innovation, Tohoku University, Sendai 980-8579, Japan
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(7), 804; https://doi.org/10.3390/electronics8070804
Received: 1 June 2019 / Revised: 10 July 2019 / Accepted: 13 July 2019 / Published: 18 July 2019
(This article belongs to the Special Issue Energy Efficient Circuit Design Techniques for Low Power Systems)
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Abstract

A gastric acid battery and its charge storage in a capacitor are a simple and safe method to provide a power source to an ingestible device. For that method, the electromotive force of the battery should be boosted for storing a large amount of energy. In this study, we have proposed an all-p-channel metal-oxide semiconductor (pMOS)-based cross-coupled voltage multiplier (CCVM) utilizing single-well CMOS technology to achieve a voltage boosting higher than from a conventional complementary MOS (CMOS) CCVM. We prototyped a custom integrated circuit (IC) implemented with the above CCVMs and a ring oscillator as a clock source. The characterization experiment demonstrated that our proposed pMOS-based CCVM can boost the input voltage higher because it avoids the body effect problem resulting from an n-channel MOS transistor. This circuit was also demonstrated to significantly reduce the circuit area on the IC, which is advantageous as it reduces the chip size or provides an area for other functional circuits. This simple circuit structure based on mature and low-cost technologies matches well with disposal applications such as an ingestible device. We believe that this pMOS-based CCVM has the potential to become a useful energy harvesting circuit for ingestible devices. View Full-Text
Keywords: ingestible device; gastric acid battery; cross-coupled voltage multiplier; charge pump; body effect ingestible device; gastric acid battery; cross-coupled voltage multiplier; charge pump; body effect
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Yoshida, S.; Miyaguchi, H.; Nakamura, T. Prototyping of an All-pMOS-Based Cross-Coupled Voltage Multiplier in Single-Well CMOS Technology for Energy Harvesting Utilizing a Gastric Acid Battery. Electronics 2019, 8, 804.

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