Behavioral modeling of a Sigma-Delta Modulator for sensing photocurrent in a CMOS Image Sensor

Author

Garduza-González, S. ; Gómez-Castañeda, F. ; Ponce-Ponce, V.H. ; Moreno-Cadenas, J.A.

Author_Institution

Interdiscipl. Prof. Unit on Adv. Eng. & Technol. (UPIITA), Mexico City, Mexico

fYear

2010

fDate

8-10 Sept. 2010

Firstpage

578

Lastpage

581

Abstract

We propose behavioral time-domain modeling for a Sigma-Delta Modulator (ΣΔM) to sense photocurrent in a CMOS Image Sensor (CIS). The model starts from transfer function for first-order single-bit ΣΔM in discrete-time, and then adds noise sources and nonlinearities by introducing noise floor and harmonic distortion, which determine system performance. The results were compared with the measurements of a CIS based ΣΔM circuit prototype fabricated with CMOS technology. The model showed good agreement with measurements.

Keywords

CMOS image sensors; harmonic distortion; photoconductivity; sigma-delta modulation; time-domain analysis; transfer functions; CMOS image sensor; harmonic distortion; noise sources; nonlinearities; photocurrent sensing; sigma-delta modulator; time-domain modeling; transfer function; CMOS image sensors; Integrated circuit modeling; Jitter; Modulation; Noise; Photoconductivity; Photodiodes; CMOS image sensor; Sigma-Delta modulator; behavioral modeling; passive pixel sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Engineering Computing Science and Automatic Control (CCE), 2010 7th International Conference on

Conference_Location

Tuxtla Gutierrez

Print_ISBN

978-1-4244-7312-0

Type

conf

DOI

10.1109/ICEEE.2010.5608633

Filename

5608633