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Proceedings Paper

A high-performance read-out IC design for IR image sensor applications
Author(s): Sang Jun Hwang; Ho Hyun Shin; Eun Sik Jung; Man Young Sung
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Paper Abstract

We propose a high performance ROIC for IR image sensor applications. Because a micro bolometer image sensor, used in an IR image sensor, is made by a MEMS process, the resistance of bolometers by each process does not appear same value under same IR energy incident condition. This resistance variation generates a different output signal for same input by each chip. Instead of a single input mode, we used a differential input mode to the proposed ROIC and thus, a new circuit structure that has high immunity to the process variations of micro bolometer was invented. This result is due to the characteristics of the differential input mode that suppress the commonly appeared error and amplify the differentially applied signal. Using results from a computer simulation, improvement such as that the effect of the process error on the bolometer's resistance was decreased 10 ~ 12% without an additional compensation circuit was found. Moreover we had analyzed the results by numerical methods and found that it is possible to control the gain and compensation ability by design the capacitors of the integrator appropriately. A full chip including a ROIC and a micro bolometer with 16 X 16 cell arrays was designed and implemented in standard 0.25um CMOS process.

Paper Details

Date Published: 21 December 2007
PDF: 8 pages
Proc. SPIE 6798, Microelectronics: Design, Technology, and Packaging III, 679818 (21 December 2007); doi: 10.1117/12.759053
Show Author Affiliations
Sang Jun Hwang, Korea Univ. (South Korea)
Ho Hyun Shin, Korea Univ. (South Korea)
Eun Sik Jung, Korea Univ. (South Korea)
Man Young Sung, Korea Univ. (South Korea)

Published in SPIE Proceedings Vol. 6798:
Microelectronics: Design, Technology, and Packaging III
Alex J. Hariz; Vijay K. Varadan, Editor(s)

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