An All LTPS-TFT-Based Charge-Integrating Amplifier for Sensor-Array Readout Circuit on Flexible Substrate

This article presents the design of a readout circuit for charge-output sensor arrays integrated on a flexible substrate. The charge-integrating amplifier is built with a current-output transimpedance amplifier that includes the integrator function with reset. The charge-integrating amplifier has a...

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Bibliographic Details
Published in:IEEE open journal of solid-state circuits 2022, Vol.2, p.208-216
Main Authors: Dandekar, Mohit, Myny, Kris, Dehaene, Wim
Format: Article
Language:English
Subjects:
Capacitance
Capacitive micromachined ultrasonic transducer (CMUT) array
charge amplifier
Circuit design
Feedback amplifiers
Foils
Impedance
Inverters
Low temperature
LTPS-TFT
Micromachining
passive-pixel readout
Polysilicon
Resistors
Sensor arrays
Substrates
Topology
transimpedance amplifier (TIA)
Transistors
Ultrasonic transducer arrays
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Description
Summary:This article presents the design of a readout circuit for charge-output sensor arrays integrated on a flexible substrate. The charge-integrating amplifier is built with a current-output transimpedance amplifier that includes the integrator function with reset. The charge-integrating amplifier has a fully differential internal topology, improving over single-ended design, including the feedback amplifier implemented specifically as a Nauta-transconductor. The readout circuit has been manufactured in a 3- \mu \text{m} low-temperature polysilicon process on foil and measured, achieving a bandwidth of 200 kHz, operation at a 5-V supply while consuming 586- \mu \text{W} power and maintaining a maximum integral nonlinearity of 5%.
ISSN:2644-1349
2644-1349
DOI:10.1109/OJSSCS.2022.3213772