DocumentCode :
1980602
Title :
Prototype chip and methodology for characterization of phototransistor and photodiodes
Author :
Castillo, Gelacio Castillo ; Barranca, Mario Alfredo Reyes ; Lamont, Jair Garcìa ; Nava, Luis Martín Flores ; Cárdenas, Oliverio Arellano
Author_Institution :
ESCOM-IPN, CINVESTAV-IPN, Mexico City
fYear :
2008
fDate :
12-14 Nov. 2008
Firstpage :
443
Lastpage :
448
Abstract :
A prototype chip for characterization of optical devices is presented based on a simple architecture. This is very useful for the characterization of Phototransistors and photodiodes and also for custom design pixels for image cameras. Phototransistors and photodiodes in a matrix of 6times4, have been used, this is, six rows by four columns. Reading is carried out in the voltage-mode which is different from other reported architecture, where current-mode is used. The pixel architecture is based on four p-channel transistors: shutter, reset, row-select and buffer integrator. The transistor called buffer-integrator in the pixel, converts the photocurrent from the photosensor into voltage. Both, the transistor buffer-integrator and a current source, form a voltage amplifier, with gain close to 32 dB. The capacitance in the integrating node was estimated from the L-Edit software extractor. Photocurrent, dark current, dynamic range and quantum efficiency, were estimated from data such as, capacitance, integrated voltage, voltage gain and time of integration. Good approximation between simulation during design and measurement on chip, was obtained which demonstrates the great powerful application of design tools.
Keywords :
amplifiers; image sensors; photoconductivity; photodiodes; photoemission; phototransistors; readout electronics; L-Edit software extractor; buffer integrator; current-mode; dark current; optical devices; p-channel transistors; photocurrent; photodiodes; photosensor; phototransistor; pixel architecture; quantum efficiency; shutter; voltage amplifier; voltage gain; voltage-mode; Cameras; Optical amplifiers; Optical devices; Photoconductivity; Photodiodes; Phototransistors; Pixel; Prototypes; Quantum capacitance; Voltage; Photocurrent; Prototype Amplifier; gain; photo-voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Engineering, Computing Science and Automatic Control, 2008. CCE 2008. 5th International Conference on
Conference_Location :
Mexico City
Print_ISBN :
978-1-4244-2498-6
Electronic_ISBN :
978-1-4244-2499-3
Type :
conf
DOI :
10.1109/ICEEE.2008.4723372
Filename :
4723372
Link To Document :
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