A 150 mV, Sub-1 nW, 0.75%-Full-Scale INL Delta-Sigma ADC for Power-Autonomous Sensor Nodes

Catania, Alessandro; Ria, Andrea; Manfredini, Giuseppe; Dei, Michele; Piotto, M.; Bruschi, P.

doi:10.1109/esscirc55480.2022.9911235

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…Recent advances in the development of ultra-low voltage circuits with supply voltages from 400 mV down to 150 mV enabled the development of many electronic circuits such as amplifiers [33,34], voltage references [35], analog filters [11,36], data converters [37][38][39], integrated sensors [40], and microprocessors [41]. However, harvesting energy from the environment and providing such a controlled supply voltage remains a challenging task.…”

Section: Contributionmentioning

confidence: 99%

A Regulated 400-mV CMOS DC-DC Converter with On-the-Fly Equivalent Output Resistance Tuning

et al. 2023

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Energy harvesting is a technology that can be applied to IoT systems to eliminate the need for batteries. Many types of energy sources are available for energy harvesting, such as light, thermal, vibration, and electromagnetic energy. Indoors, where most IoT devices are located, artificial light, such as from LED lamps, can be used for energy harvesting in circuits with very ultra-low power consumption. Integrated switch-capacitor DC-DC converters are required for this type of system to convert the harvested energy into a constant output voltage suitable for powering an electronic circuit. The idea of this work is to use a hysteretic feedback control consisting of comparators and a logic system to adjust the switching frequency and the voltage conversion ratio (VCR) of the converter. With this, the equivalent output resistance is tuned to a value that results in a constant output voltage. A new method for modeling the equivalent output resistance based on charge flow analysis is proposed, which also considers the effects of source resistance. An integrated energy-harvesting system consisting of a switched-capacitor DC-DC converter is implemented to obtain an output voltage of 400 mV using a small photovoltaic cell for energy harvesting from indoor light. The proposed system can power an ultra-low-power device between 20 μW and 40 μW with a minimum input voltage of 230 mV. Electrical simulation results show that the implemented converter can achieve a peak efficiency of 81.24% at an input voltage of 260 mV for a 20 μW load.

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Section: Contributionmentioning

confidence: 99%

A Regulated 400-mV CMOS DC-DC Converter with On-the-Fly Equivalent Output Resistance Tuning

et al. 2023

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“…Analog-to-digital converters (ADCs) are among the most important blocks in biomedical signal acquisition systems and, more generally, in smart devices that often process in the digital domain data acquired by analog sensors. Several ADC architectures have been proposed in the literature; in the biomedical and IoT contexts, where low-frequency signals must be digitized with medium-high resolution and extremely low power consumption, the most commonly used are the successive approximation register (SAR) ADC [16][17][18][19][20][21][22][23][24][25][26][27][28][29] and the sigma-delta ADC [30][31][32][33][34]. A key element of all these architectures is the comparator, whose purpose is to determine the sign of the input differential voltage, providing an output that can be interpreted as a logic 0 or 1 level.…”

Section: Introductionmentioning

confidence: 99%

A 0.15-to-0.5 V Body-Driven Dynamic Comparator with Rail-to-Rail ICMR

Sala

Spinogatti

Bocciarelli

et al. 2023

JLPEA

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In this paper, a novel dynamic body-driven ultra-low voltage (ULV) comparator is presented. The proposed topology takes advantage of the back-gate configuration by driving the input transistors’ gates with a clocked positive feedback loop made of two AND gates. This allows for the removal of the clocked tail generator, which decreases the number of stacked transistors and improves performance at low VDD. Furthermore, the clocked feedback loop causes the comparator to behave as a full CMOS latch during the regeneration phase, which means no static power consumption occurs after the outputs have settled. Thanks to body driving, the proposed comparator also achieves rail-to-rail input common mode range (ICMR), which is a critical feature for circuits that operate at low and ultra-low voltage headrooms. The comparator was designed and optimized in a 130-nm technology from STMicroelectronics at VDD=0.3 V and is able to operate at up to 2 MHz with an input differential voltage of 1 mV. The simulations show that the comparator remains fully operational even when the supply voltage is scaled down to 0.15 V, in which case the circuit exhibits a maximum operating frequency of 80 kHz at Vid=1 mV.

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A 0.12-V 200-Hz-BW 10-Bit ADC Using Quad-Channel VCO and Interpolation Linearization

Smith,

Barton,

Kuan

et al. 2023

2023 IEEE Asian Solid-State Circuits Conference (A-Sscc)

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A 150 mV, Sub-1 nW, 0.75%-Full-Scale INL Delta-Sigma ADC for Power-Autonomous Sensor Nodes

Cited by 6 publications

References 16 publications

A Regulated 400-mV CMOS DC-DC Converter with On-the-Fly Equivalent Output Resistance Tuning

A Regulated 400-mV CMOS DC-DC Converter with On-the-Fly Equivalent Output Resistance Tuning

A 0.15-to-0.5 V Body-Driven Dynamic Comparator with Rail-to-Rail ICMR

A 0.12-V 200-Hz-BW 10-Bit ADC Using Quad-Channel VCO and Interpolation Linearization

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