Low-Power Switched Operational Amplifier Using a-InGaZnO TFTs

Shukla, Suprateek; Tiwari, Bhawna; Wadhwa, Nishtha; Bahubalindruni, Pydi Ganga; Barquinha, Pedro

doi:10.1007/978-981-13-5950-7_32

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…However, from the overall perspective of the sensing device, such improvement is relatively small. Taking the studies mentioned above as examples [ 143 , 144 ], they can bring microwatt levels of power reduction, while the power consumption of portable sensors is often at the milliwatt level. Alternatively, enhancing the power supply can solve the energy problem including using batteries with a high energy density [ 145 ] and fast charging capability [ 146 , 147 ], as well as applying self-powered designs that sensors obtain energy from the behavior of wearer [ 148 , 149 ], body temperature [ 150 , 151 ], body fluids [ 152 ], friction[ 153 ], raindrop [ 154 ], and sunlight [ 155 ].…”

Section: Discussionmentioning

confidence: 99%

Progress in Data Acquisition of Wearable Sensors

Liu

Kong

et al. 2022

Biosensors

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Wearable sensors have demonstrated wide applications from medical treatment, health monitoring to real-time tracking, human-machine interface, smart home, and motion capture because of the capability of in situ and online monitoring. Data acquisition is extremely important for wearable sensors, including modules of probes, signal conditioning, and analog-to-digital conversion. However, signal conditioning, analog-to-digital conversion, and data transmission have received less attention than probes, especially flexible sensing materials, in research on wearable sensors. Here, as a supplement, this paper systematically reviews the recent progress of characteristics, applications, and optimizations of transistor amplifiers and typical filters in signal conditioning, and mainstream analog-to-digital conversion strategies. Moreover, possible research directions on the data acquisition of wearable sensors are discussed at the end of the paper.

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Section: Discussionmentioning

confidence: 99%

Progress in Data Acquisition of Wearable Sensors

Liu

Kong

et al. 2022

Biosensors

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“…Because of which, CMOS circuit techniques cannot be adapted directly and new design techniques need to be investigated. Till date many a-IGZO TFT based circuits have been reported on flexible substrates such as amplifiers [11], [12], [13], ring oscillators [14], filters [15], bootstrapping circuit [5] and rectifiers [16]. The work done towards analog-to-digital Converters (ADCs) with oxide TFTs is very limited, though they are critical functional blocks to implement systems of practical importance.…”

Section: Introductionmentioning

confidence: 99%

Mostly Passive Δ - Σ ADC with a-IGZO TFTs for Flexible Electronics

Wadhwa

Bahubalindruni

Correia

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper presents a novel mostly passive ∆-Σ ADC using amorphous Indium Gallium Zinc Oxide (a-IGZO) thin-film transistors (TFTs). The ADC circuit consists of passive elements (resistors and capacitors), a novel dynamic comparator, a D-Flip Flop and a pseudo-CMOS BS inverter. In-house oxide TFT model is used for circuit simulations in Cadence environment. The proposed ADC results in effective-numberof-bits (ENOB) of 11.2 bits and a figure-of-merit (FOM) of 0.15 µJ/conversion step at 2 kHz sampling frequency with a 10 V power supply. This circuit would find potential applications in biomedical wearable systems, in which, the ADC is probably the most important block.

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Low-Power Switched Operational Amplifier Using a-InGaZnO TFTs

Cited by 2 publications

References 23 publications

Progress in Data Acquisition of Wearable Sensors

Progress in Data Acquisition of Wearable Sensors

Mostly Passive Δ - Σ ADC with a-IGZO TFTs for Flexible Electronics

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