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An efficient low voltage, high frequency silicon CMOS light emitting device and electro-optical interface

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4 Author(s)
Snyman, L.W. ; Dept. of Electr. & Electron. Eng., Pretoria Univ., South Africa ; du Plessis, M. ; Seevinck, E. ; Aharoni, H.

A silicon light emitting device was designed and realized utilizing a standard 2-μm industrial CMOS technology design and processing procedure. The device and its associated driving circuitry were integrated in a CMOS integrated circuit and can interface with a multimode optical fiber. The device delivers 8 nW of optical power (450-850 nm wavelength) per 20-μm diameter of chip area at 4.0 V and 5 mA. The device emits light by means of a surface assisted Zener breakdown process that occurs laterally between concentrically arranged highly doped n/sup +/ rings and a p/sup +/ centroid, which are all coplanarly arranged with an optically transparent Si-SiO2 interface. Theoretical and experimental determinations with capacitances and series resistances indicate that the device has an intrinsic high-frequency operating capability into the near gigahertz range.

Published in:

Electron Device Letters, IEEE  (Volume:20 ,  Issue: 12 )