CMOS Integrated Capacitive DC-DC Converters

Breussegem, Tom Van; Steyaert, Michiel

doi:10.1007/978-1-4614-4280-6

Cited by 50 publications

(39 citation statements)

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“…First, the tuning range of the input impedance has to be expanded; as a result of an improved energy harvest source, its source impedance is decreased to 1 Ω. Second, silicon area is limited to handle more power with an switched capacitor converter; half of energy is lost when charges are transferred through capacitors [11]. However, on-chip capacitance given by a technology is a few fF per micrometer square.…”

Section: The Open Problemsmentioning

confidence: 99%

An Area Efficient Thermal Energy Harvester With Reconfigurable Capacitor Charge Pump for IoT Applications

Yoon

Carreon-Bautista

Sánchez-Sinencio

2018

IEEE Trans. Circuits Syst. II

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Renewable energy sources are promising alternatives to a battery. Due to the varying power profile of renewable energy sources, an energy harvester needs the different power management techniques including boosting the small input voltage. The awareness of the demand, this thesis introduces an integrated energy harvester system targeting Internet of Things (IoT) sensor applications such as a wireless temperature sensor. The proposed design extracts energy from a thermal energy generator (TEG), and provides the regulated output voltage. To ensure the maximum power extraction, the proposed energy harvester includes multiple circuit level techniques. First, the reconfigurable capacitor charge pump distributes on-chip capacitors to required step-up stages. This approach optimizes the silicon area by utilizing 100% on-chip capacitors regardless of a charge pump conversion gain. Second, the design is capable of 3 dimensional Maximum Power Point Tracking (MPPT), matching a source impedance to input impedance of an energy harvest source. Thus, the proposed energy harvester is able to extract power from a small form factor TEG, having low source impedance (1 Ω). With the increased matching range, up to 500 µW is available at the output for IoT applications. Experimental results show an end-to-end power efficiency of 64% @ 1 V output voltage, and the input impedance matching range of 1 Ω-5 kΩ. The energy harvester was fabricated in 130 nm Complementary Metal-Oxide-Semiconductor (CMOS) standard technology, and occupies 0.835 mm 2 . ii DEDICATION To my parents, advisor Dr. Edgar Sánchez-Sinencio. iii ACKNOWLEDGMENTS I would like to thank the Texas A&M University to allow me to have fantastic experiences. Special thanks to Dr. Edgar Sánchez-Sinencio. It is my great honor and privilege to learn how to conduct research. iv CONTRIBUTORS AND FUNDING SOURCES Contributors This work was supported by a thesis committee consisting of Professor

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Section: The Open Problemsmentioning

confidence: 99%

An Area Efficient Thermal Energy Harvester With Reconfigurable Capacitor Charge Pump for IoT Applications

Yoon

Carreon-Bautista

Sánchez-Sinencio

2018

IEEE Trans. Circuits Syst. II

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“…The stimulation voltage is derived from the main supply by using an 1 : 1 switched-capacitor DC-DC converter. This particular topology of DC-DC converter operates as a resistor [2]. The further away the output voltage is from the input voltage, the lower the power efficiency is.…”

Section: Comments and Correctionsmentioning

confidence: 99%

Comments on “Compact, Energy-Efficient High-Frequency Switched Capacitor Neural Stimulator With Active Charge Balancing”

Urso

Giagka

Serdijn

2019

IEEE Trans. Biomed. Circuits Syst.

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“…This widely used model [5], reveals that R out has to be controllable in order to maintain a desired V out when both V in and I load are varying given that N = 1/3 is fixed by the topology. The expressions for R out in the two extremes, slow switching limit (SSL) and fast switching limit (FSL), for when the switching period is much greater or smaller than the time constant of C f ly and the switch resistance, shows how R out depends on R sw and F sw [3]:…”

Section: A Output Stage Fundamentalsmentioning

confidence: 99%

Switched capacitor DC-DC converter with switch conductance modulation and Pesudo-fixed frequency control

Larsen

Vinter²,

Jørgensen

2017

ESSCIRC 2017 - 43rd IEEE European Solid State Circuits Conference

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CMOS Integrated Capacitive DC-DC Converters

Cited by 50 publications

References 0 publications

An Area Efficient Thermal Energy Harvester With Reconfigurable Capacitor Charge Pump for IoT Applications

An Area Efficient Thermal Energy Harvester With Reconfigurable Capacitor Charge Pump for IoT Applications

Comments on “Compact, Energy-Efficient High-Frequency Switched Capacitor Neural Stimulator With Active Charge Balancing”

Switched capacitor DC-DC converter with switch conductance modulation and Pesudo-fixed frequency control

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