A novel hybrid active-passive pixel with correlated double sampling CMOS readout circuit for medical x-ray imaging

A novel hybrid active-passive pixel with correlated double sampling CMOS readout circuit for medical x-ray imaging

This paper presents a new hybrid current-programmed, current-output active pixel sensor (APS) suitable for real time x-ray imaging (fluoroscopy) and an off-panel CMOS readout circuit. The pixel circuit is designed using hydrogenated amorphous silicon (a-Si:H) thin film transistor (TFT) technology. T...

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Hauptverfasser: Safavian, N., Chaji, G. R., Karim, K.S., Rowlands, J. A.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Biomedical imaging
Circuits
CMOS image sensors
Low-frequency noise
Pixel
Sampling methods
Sensor phenomena and characterization
Thin film transistors
Threshold voltage
X-ray imaging
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creator Safavian, N.
Chaji, G. R.
Karim, K.S.
Rowlands, J. A.
description This paper presents a new hybrid current-programmed, current-output active pixel sensor (APS) suitable for real time x-ray imaging (fluoroscopy) and an off-panel CMOS readout circuit. The pixel circuit is designed using hydrogenated amorphous silicon (a-Si:H) thin film transistor (TFT) technology. The simulation results based on the measured characteristics of a-Si:H TFTs show that the proposed pixel circuit can successfully compensate for characteristic variations (e.g. mobility and threshold voltage shift) in a-Si:H TFTs under prolonged gate voltage stress. The readout circuit exploits correlated double sampling (CDS) technique to reduce the offset current, low frequency noise and fixed-pattern noise (FPN) on the array operation.
doi_str_mv 10.1109/ISCAS.2008.4542131
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subjects Biomedical imaging
Circuits
CMOS image sensors
Low-frequency noise
Pixel
Sampling methods
Sensor phenomena and characterization
Thin film transistors
Threshold voltage
X-ray imaging
title A novel hybrid active-passive pixel with correlated double sampling CMOS readout circuit for medical x-ray imaging
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