A 52 µW Heart-Rate Measurement Interface Fabricated on a Flexible Foil with A-IGZO TFTs

Zulqarnain, Mohammad; Stanzione, Stefano; Steen, Jan‐Laurens P. J. van der; Myny, Kris; Abdinia, Sahel; Cantatore, Eugenio

doi:10.1109/esscirc.2018.8494298

Cited by 18 publications

(31 citation statements)

References 4 publications

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“…Front-end signal amplification increases the SNR and enables the detection of small electric signals. For this purpose, voltage [44,205,540,[577][578][579][580][581][582], transimpedance [583], differential [23], and buffer amplifiers on flexible substrates have been reported [217,222]. Figure 15a shows an on-site conditioned flexible magnetic sensor consisting of a differential GMR in a Wheatstone configuration, a fully flexible a-IGZO differential amplifier with a common mode rejection ratio (CMRR) of 44 dB and SNR of 56 dB.…”

Section: Circuitsmentioning

confidence: 99%

“…In addition, an a-Si compressive acquisition system was capable to measure a 7 channel EEG sensor with errors below 8% at 64x compression [205]. Using a similar approach, Zulqarnain et al [581] demonstrated a chopper amplifier and reset integrator based on a-IGZO for the on-site processing of a flexible heart rate sensor's signal. Although this device presented a slightly higher noise level of 186.3 µV, its power consumption was only 0.052 mW, whereas the a-Si device had a power consumption of 11 mW [205,581].…”

Section: Circuitsmentioning

confidence: 99%

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Flexible Sensors—From Materials to Applications

et al. 2019

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Flexible sensors have the potential to be seamlessly applied to soft and irregularly shaped surfaces such as the human skin or textile fabrics. This benefits conformability dependant applications including smart tattoos, artificial skins and soft robotics. Consequently, materials and structures for innovative flexible sensors, as well as their integration into systems, continue to be in the spotlight of research. This review outlines the current state of flexible sensor technologies and the impact of material developments on this field. Special attention is given to strain, temperature, chemical, light and electropotential sensors, as well as their respective applications.

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Section: Circuitsmentioning

confidence: 99%

Section: Circuitsmentioning

confidence: 99%

Flexible Sensors—From Materials to Applications

et al. 2019

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“…An overview of the main circuit performance of our ECG interface and some relevant publications is given in Table I. The better performance compared to [4] is due to both TFT technology and circuit improvements. From the technology perspective, the self-aligned IGZO technology used in this work has a Hooge factor which is around five orders of magnitude better than the IGZO technology used in [4] and thus contributes less 1/f noise.…”

Section: B Signal Reconstructionmentioning

confidence: 99%

“…Moreover, the power consumption reported in [1] is 11 mW, which is rather high for wearable applications. The power consumption reported in [4] is much lower, but the total input referred noise achieved in that work is relatively high, enabling only HR measurements. The input signal is digitized in [5] but power consumption is still 2 mW, and the circuit 978-1-7281-0557-4/19/$31.00 ©2019 IEEE does not provide a voltage, but a current input, making it inconvenient to measure bio-potentials.…”

Section: Introductionmentioning

confidence: 97%

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A Low Power Time Domain ECG Interface Based on Flexible a-IGZO TFTs

Zulqarnain

Stanzione

Steen

et al. 2019

2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI)

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This work presents a low power ECG interface for wearable applications, based on unipolar a-IGZO TFTs manufactured on a flexible substrate. The interface consists of a cascaded diode-connected load preamplifier followed by a reset integrator, which is used to convert the voltage signal to a pulsewidth modulated (PWM) representation. The output is thus provided as a binary PWM waveform, which can be conveniently sent to a reader device using wireless communication and can be further converted to a digital representation using a simple counter. The flicker noise and the offset are eliminated using an approach similar to correlated double sampling. An input chopper is exploited to alternate the connection between the inputs of the preamplifier for each sample. The output signal is then extracted by subtracting two consecutive samples after conversion to the digital domain. In this way offset and lowfrequency noise, which are correlated between the two samples, are effectively cancelled.

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An Integrated Analog Front‐End System on Flexible Substrate for the Acquisition of Bio‐Potential Signals

et al. 2023

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The application of a versatile, low-temperature thin-film transistor (TFT) technology is presently described as the implementation on a flexible substrate of an analog front-end (AFE) system for the acquisition of bio-potential signals. The technology is based on semiconducting amorphous indium-gallium-zinc oxide (IGZO). The AFE system consists of three monolithically integrated constituent components: a bias-filter circuit with a bio-compatible low cut-off frequency of ≈1 Hz, a 4-stage differential amplifier offering a large gain-bandwidth product of ≈955 kHz, and an additional notch filter exhibiting over 30 dB suppression of the power-line noise. Respectively built using conductive IGZO electrodes with thermally induced donor agents and enhancement-mode fluorinated IGZO TFTs with exceptionally low leakage current, both capacitors and resistors with significantly reduced footprints are realized. Defined as the ratio of the gain-bandwidth product of an AFE system to its area, a record-setting figure-of-merit of ≈86 kHz mm −2 is achieved. This is about an order of magnitude larger than the < 10 kHz mm −2 of the nearest benchmark. Requiring no supplementary off-substrate signal-conditioning components and occupying an area of ≈11 mm 2 , the stand-alone AFE system is successfully applied to both electromyography and electrocardiography (ECG).

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A 52 µW Heart-Rate Measurement Interface Fabricated on a Flexible Foil with A-IGZO TFTs

Cited by 18 publications

References 4 publications

Flexible Sensors—From Materials to Applications

Flexible Sensors—From Materials to Applications

A Low Power Time Domain ECG Interface Based on Flexible a-IGZO TFTs

An Integrated Analog Front‐End System on Flexible Substrate for the Acquisition of Bio‐Potential Signals

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