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Proceedings Paper

CMOS in-pixel optical pulse frequency modulator
Author(s): Nicolaas E. Nel; M. du Plessis; T.-H. Joubert
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Paper Abstract

In this paper, a CMOS image detector array is presented that can convert a photocurrent generated by light falling onto a photodiode to a measurable output frequency. The designed array consists of 64 pixels, each containing an n+ -p+ /psubstrate photodiode along with all signal-to-frequency conversion circuitry. The 8x8 array was designed using the ams 350 nm process, with each individual pixel occupying an area of 30×30 μm2 . Measurements on the fabricated array show that a dynamic range of 10 - 15 dB can be achieved with a maximum output frequency of 125 kHz. Work was done to increase the output driving capability of the array to increase the dynamic range of the pixel in simulations to 54 dB. Further research will also investigate ways of implem

Paper Details

Date Published: 24 January 2019
PDF: 11 pages
Proc. SPIE 11043, Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, 110430C (24 January 2019); doi: 10.1117/12.2502455
Show Author Affiliations
Nicolaas E. Nel, Univ. of Pretoria (South Africa)
M. du Plessis, Univ. of Pretoria (South Africa)
T.-H. Joubert, Univ. of Pretoria (South Africa)

Published in SPIE Proceedings Vol. 11043:
Fifth Conference on Sensors, MEMS, and Electro-Optic Systems
Monuko du Plessis, Editor(s)

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