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A Low Power Time Domain ECG Interface Based on Flexible a-IGZO TFTs
- Source :
- IWASI, 2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI), Proceedings-2019 8th International Workshop on Advances in Sensors and Interfaces, IWASI 2019, 205-209, STARTPAGE=205;ENDPAGE=209;TITLE=Proceedings-2019 8th International Workshop on Advances in Sensors and Interfaces, IWASI 2019, Proceedings-2019 8th International Workshop on Advances in Sensors and Interfaces, IWASI 2019, 8th International Workshop on Advances in Sensors and Interfaces, IWASI 2019, 13 June 2019 through 14 June 2019, 205-209
- Publication Year :
- 2019
- Publisher :
- IEEE, 2019.
-
Abstract
- 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 pulse-width 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 low-frequency noise, which are correlated between the two samples, are effectively cancelled.
- Subjects :
- 010302 applied physics
Industrial Innovation
Correlated double sampling
ECG
Preamplifier
Computer science
020208 electrical & electronic engineering
IGZO
Bio-signal read out
02 engineering and technology
01 natural sciences
Chopper
voltage to pulse width conversion
Integrator
0103 physical sciences
0202 electrical engineering, electronic engineering, information engineering
Electronic engineering
Voltage to pulse width conversion
Waveform
Flicker noise
Time domain
bio-signal read out
Pulse-width modulation
Subjects
Details
- ISBN :
- 978-1-72810-557-4
- ISBNs :
- 9781728105574
- Database :
- OpenAIRE
- Journal :
- 2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI)
- Accession number :
- edsair.doi.dedup.....ce04fe9b6252ec6f0eb5e0175bbec0de