A 1.2&amp;#x00B5;W SIMO energy harvesting and power management unit with constant peak inductor current control achieving 83&amp;#x2013;92% efficiency across wide input and output voltages

Shrivastava, Aatmesh; Ramadass, Yogesh; Khanna, Sudhanshu; Bartling, Steven; Calhoun, Benton H.

doi:10.1109/vlsic.2014.6858364

Cited by 14 publications

(19 citation statements)

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“…However, due to the low in our application, the transconductance and values might have similar magnitudes. Thus, a detailed expression for is provided in (8). As expected, satisfactory phase margin and loop stability can only be achieved if enough separation exists between and for all of interest.…”

Section: A Basic Cl-ldomentioning

confidence: 83%

“…Energy harvesting (EH) units have emerged as a valuable alternative to either replace or complement the battery-operation of wireless transmitters [6], [7]. In such systems, whether energy is harvested from human [6], RF [7], solar [8], vibrational [9], thermal [10], or multiple sources [11]- [13], reducing the intrinsic power consumption of the EH-PMU is critical for an efficient solution.…”

Section: Introductionmentioning

confidence: 99%

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A Power Management Unit With 40 dB Switching-Noise-Suppression for a Thermal Harvesting Array

Zarate-Roldan

Carreon-Bautista

Costilla-Reyes

et al. 2015

IEEE Trans. Circuits Syst. I

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A high efficiency, maximum power point tracking (MPPT) power management unit (PMU), with 3.6 quiescent power, aimed at a thermoelectric generator (TEG) array is presented. The proposed energy harvesting PMU is made up of a boost converter with a cascaded capacitor-less low drop-out (CL-LDO) voltage regulator. The segmented approach allows the PMU to match the TEG array's changing dynamic series resistance via the boost converter and simultaneously provide voltage regulation with adaptive, high switching noise rejection via the CL-LDO. The boost converter's switching frequency is tracked via a Sense-and-Control loop which modifies the CL-LDO's power supply rejection (PSR) characteristics to place a notch in the PSR transfer function around the average. Experimental results show an overall system efficiency better than 57% @ 1.6 V output voltage, PSR of 40 dB at , and a notch-tuning range of 15-65 kHz. The total active area is 0.93 in 0.5 CMOS.

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Section: A Basic Cl-ldomentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

A Power Management Unit With 40 dB Switching-Noise-Suppression for a Thermal Harvesting Array

Zarate-Roldan

Carreon-Bautista

Costilla-Reyes

et al. 2015

IEEE Trans. Circuits Syst. I

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“…This work introduces the concept of "sloppy yet power-efficient voltage regulation" in context of efficient power delivery at sub-µW loads (Chapter 3). By relaxing line/load regulation constraints and allowing optimal load-specific supply voltage ripple (which is governed by component-level specifications), the "always-ON" quiescent power of the regulators is reduced by ∼10X as compared to existing works, such as [21]. In addition to regulators, this work also presents several other "always-ON" components, such as an ULP reference generator (Chapter 3) and an event-driven wakeup receiver (Chapter 5), which achieves the lowest DC power consumption (7.4nW) as compared to other existing receivers [22], which have reported a sensitivity greater than -70dBm.…”

Section: Thesis Contributionsmentioning

confidence: 99%

“…and regulate the output voltage, V OU T at the desired conversion ratio. Depending on the architecture of the control scheme, either V OU T [21] or the inductor current [47] is sensed through a feedback network (not shown in Figure 3 OFF when the inductor current crosses zero. Thus in an ideal case, the voltage conversion ratio is given by:…”

Section: Ldo Regulatorsmentioning

confidence: 99%

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Power Management in Ultra-Low Power Systems

Roy¹

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The evolving vision of the Internet-of-Things (IoT) will revolutionize various applications such as remote health monitoring, home automation and remote surveillance. It has been projected that by 2025, there will be 1 trillion IoT devices influencing our daily lives. This will result in the generation of an enormous amount of data, which will have to be stored, processed and transmitted efficiently and reliably. Although advancements in Integrated Circuit (IC) design and the availability of various Ultra-low Power (ULP) circuit components have helped us to visualize an ecosystem of numerous internet-connected devices, the overall system integration will become a major challenge. A System-on-Chip (SoC), catering to IoT applications is expected to contain many different circuit components such as sensors and Analog-Front-Ends (AFEs) for real-time signal acquisition, analog-to-digital converters, digital signal processors, memories, wireless transceivers etc. All these components have different supply voltage requirements and power profiles. Hence, power delivery to such components in an SoC will play an important role in the overall system architecture. Although, battery-powered systems have traditionally worked well in portable electronics but in an IoT ecosystem, the cost of battery replacement in a trillion-sensor node network will be enormous. In many applications, such as remote surveillance, systems require a long operational lifetime. Moreover, system deployment should be unobtrusive and hence such systems should have small form factors.The above requirements are hard to meet using conventional battery-powered systems. Hence, in most IoT SoCs, there is a strong motivation for an integrated Power Management Unit (PMU), with energy harvesting capability for near-perpetual battery-less operation, which i Abstract ii can provide a range of supply voltage rails to satisfy the electrical specifications of different functional units.This dissertation addresses the design challenges related to energy autonomy and powerdelivery in a wireless sensor node. This work presents an energy harvesting platform in context of a self-powered System-in-Package (SiP) with a capability to harvest from either photovoltaic or thermoelectric generators (TEGs). The SiP consists of an SoC for processing and storage, non-volatile memory, a wireless transceiver and various off-the-shelf sensors. To deliver power and to meet the electrical specifications of these different components of the sensor node, this work presents an efficient, low quiescent power, supply-voltage regulation scheme. In addition to power delivery, this dissertation also demonstrates several ULP digital and mixed-signal circuit components, commonly used in energy-autonomous and always-ON systems such as an event-driven wakeup receiver. This work describes circuit solutions and techniques related to power delivery that will enhance the operational lifetime, reduce the overall form-factor and contribute towards attaining energy-autonomy to facilitate a wide range of a...

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Maximum power point tracking and photovoltaic energy harvesting for Internet of Things: A comprehensive review

Ahmad

Ghenaï

Bettayeb

2021

Sustainable Energy Technologies and Assessments

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A 1.2µW SIMO energy harvesting and power management unit with constant peak inductor current control achieving 83–92% efficiency across wide input and output voltages

Cited by 14 publications

References 0 publications

A Power Management Unit With 40 dB Switching-Noise-Suppression for a Thermal Harvesting Array

A Power Management Unit With 40 dB Switching-Noise-Suppression for a Thermal Harvesting Array

Power Management in Ultra-Low Power Systems

Maximum power point tracking and photovoltaic energy harvesting for Internet of Things: A comprehensive review

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