A 70&amp;#x00B0;phase margin OPAMP with positive feedback in flexible a-IGZO TFT technology

Shabanpour, R.; Ishida, Koichi; Meister, Tilo; Münzenrieder, Niko; Petti, Luisa; Salvatore, Giovanni A.; Kheradmand‐Boroujeni, Bahman; Carta, Corrado; Tröster, Gerhard; Ellinger, Frank

doi:10.1109/mwscas.2015.7282051

Cited by 21 publications

(24 citation statements)

References 12 publications

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“…A different gain-boosting scheme was applied by Shabanpour et al [132] to a metal-oxide differential amplifier. Derived from a single-input amplifier architecture investigated earlier on [131], the underlying idea is to control dynamically the overdrive voltage of the load transistors, in such a way that the transistors resemble an active load.…”

Section: Unipolar Differential Amplifiersmentioning

confidence: 99%

“…Besides organic technologies, the flexible electronics community has also investigated analogue platforms using metal-oxide semiconductors [6], [122], [123], [132], [133], [140]. This much more recent development (the first report on the subject was produced by Tai et al in 2012 [6]) is due to the later emergence of metal-oxide semiconductors.…”

Section: Semiconductorsmentioning

confidence: 99%

“…Oxide-only amplifiers reported to date all resort to vacuumdeposited gate dielectrics (PECVD SiN x [6], PECVD SiO x [133] and ALD AlO x [122], [123], [132], [140]). The use of vacuum-processed dielectrics in these works can be understood as being the conventional choice of the metal-oxide community, in spite of the emergence of solution-processed inorganic dielectrics and the wide compatibility with polymer insulators (see Chapter 2).…”

Section: Dielectricsmentioning

confidence: 99%

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Organic and Amorphous-Metal-Oxide Flexible Analogue Electronics

Pecunia

Fattori

Abdinia

et al. 2018

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Recent years have witnessed significant research efforts in flexible organic and amorphous-metal-oxide analogue electronics, in view of its formidable potential for applications such as smart sensor systems. This Element provides a comprehensive overview of this growing research area. After discussing the properties of organic and amorphous-metal-oxide technologies relevant to analogue circuits, this Element focuses on their application to two key circuit blocks: amplifiers and analogue-to-digital converters. The Element thus provides a fresh look at the evolution and immediate opportunities of the field, and identifies the remaining challenges for these technologies to become the platform of choice for flexible analogue electronics.

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Section: Unipolar Differential Amplifiersmentioning

confidence: 99%

Section: Semiconductorsmentioning

confidence: 99%

Section: Dielectricsmentioning

confidence: 99%

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Organic and Amorphous-Metal-Oxide Flexible Analogue Electronics

Pecunia

Fattori

Abdinia

et al. 2018

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“…Besides its high current driving capability, the device consumes less than 250 µW at 1.7 V and 450 µW at 3 V (1 MΩ load), rendering the circuit the most power effi cient entirely fl exible fully integrated sensory system reported so far (Table 1 ). [34][35][36][37] This remarkable energy effi ciency potentially allows the system to be powered using renewable green energy sources, e.g., fl exible energy harvesters and storage elements. [38][39][40][41] We envision that the integrated GMR bridge can be used to trigger external devices or provide feedback signals paving the way toward the realization of entirely fl exible magnetic gadgets and switches.…”

Section: Doi: 101002/aelm201600188mentioning

confidence: 99%

“…IGZO-based electronics [ 2,18,35,[58][59][60][61][62] has been chosen for its high-performance and low power operation. In particular a carrier mobility beyond 10 cm 2 Hall sensor [ 53 ] n.p.…”

Section: Doi: 101002/aelm201600188mentioning

confidence: 99%

Entirely Flexible On‐Site Conditioned Magnetic Sensorics

Münzenrieder

Karnaushenko

Petti

et al. 2016

Adv Elect Materials

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Sixth‐order differential Sallen‐and‐Key switched capacitor LPF using a‐IGZO TFTs

Wadhwa

Bahubalindruni

Chapagai

et al. 2018

Circuit Theory & Apps

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This paper presents sixth-order fully differential active low pass RC and switched-capacitor (SC) filters using N-type IGZO thin-film transistors for flexible wearable continuous health monitoring systems. As a first step, a low-gain amplifier using a diode-connected load and a fully differential amplifier is designed with positive feedback based on capacitor bootstrapping. These amplifiers present a gain around 5.03 and 40 dB, respectively, whereas their respective GBW product are around 450 and 200 kHz. Then these amplifiers are employed to realize biquads, with which a sixth-order Sallen-Key lowpass RC and SC filters are implemented. The SC filter realized with low-gain DDA has shown a simulated THD of −30.9 dB, SFDR of 30.1 dB, and a power consumption of 456 μW. On the other hand, the SC filter presents a THD of −31.4 dB, SFDR of 32.2 dB, and a power consumption of 573 μW with highgain differential difference amplifier (DDA) when a power supply of 10 V is used. Circuit simulations have been carried out in Cadence Virtuoso using in-house IGZO TFT models. KEYWORDSactive RC filters, differential amplifier and health monitoring system, IGZO TFT, switched capacitor filters 1 | INRODUCTION Continuous health monitoring of post hospitalized cardiac patients is vital. In present scenario, most of the cardio vascular system activities are being monitored using ECG and BP measurements using cuffs, which limit the mobility of the patients and need human interaction. Nevertheless, few wearable devices were reported with standard CMOS technology, 1-4 where these systems are bulky (due to the battery weight), rigid, and expensive. In order to get rid of these drawbacks and to guarantee user comfort, biomedical self-contained wearable systems implemented with low-cost flexible electronics would be a perfect solution, where circuits can be driven by printed batteries. 5,6 Among other semiconductor technologies (a-Si: H TFT and organic TFT) that allow flexible electronics due to compatibility with low-temperature fabrication (≥150°C), 7,8 amorphous indium gallium zinc oxide thin-film transistors

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A 70°phase margin OPAMP with positive feedback in flexible a-IGZO TFT technology

Cited by 21 publications

References 12 publications

Organic and Amorphous-Metal-Oxide Flexible Analogue Electronics

Organic and Amorphous-Metal-Oxide Flexible Analogue Electronics

Entirely Flexible On‐Site Conditioned Magnetic Sensorics

Sixth‐order differential Sallen‐and‐Key switched capacitor LPF using a‐IGZO TFTs

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