A High-Speed Wafer-Scale CMOS X-Ray Detector With Column-Parallel ADCs Using Oversampling Binning Method

Title
A High-Speed Wafer-Scale CMOS X-Ray Detector With Column-Parallel ADCs Using Oversampling Binning Method
Authors
권오경
Keywords
CMOS X-ray detector; column-parallel extended-counting analog-to-digital converter (EC ADC); oversampling binning operation; pipelined timing; wafer-scale sensor
Issue Date
2015-03
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON ELECTRON DEVICES, v. 62, NO 3, Page. 888-895
Abstract
This paper presents a high-speed wafer-scale CMOS X-ray detector with an active area of 12 cm x 12 cm, which features 100 mu m-sized pixels. A horizontal row driver is adopted for implementing a three-side buttable detector with the tiling technique and thereby enabling the extension of the active area. The proposed detector employs 14-b column-parallel extended-counting analog-to-digital converters (EC ADCs) using digital correlated double sampling for high-speed operation and high-gray-scale resolution. The oversampling binning method using a Delta Sigma modulator in EC ADCs is proposed for high sensitivity and the pipelined timing method is adopted for a high frame rate, which results in reduction of the X-ray dose. An offset cancellation method for the input buffer is used to improve the uniformity between column ADCs. The proposed CMOS X-ray detector is fabricated using a 0.35-mu m CMOS process with the stitching technique. The measured differential column fixed pattern noise and random noise without X-ray exposure are 3.01 and 3.06 least significant bits, respectively, at a resolution of 14 b. In the full-resolution mode, the proposed detector operates up to a frame frequency of 108 frames/s with the pipelined timing and 60 frames/s without the pipelined timing.
URI
http://ieeexplore.ieee.org/document/7006786/?arnumber=7006786http://hdl.handle.net/20.500.11754/22980
ISSN
0018-9383; 1557-9646
DOI
http://dx.doi.org/10.1109/TED.2014.2386533
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > DEPARTMENT OF ELECTRONIC ENGINEERING(융합전자공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE