Title :
A CMOS optical preamplifier for wireless infrared communications
Author :
Phang, Khoman ; Johns, David A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
fDate :
7/1/1999 12:00:00 AM
Abstract :
This paper describes a CMOS optical preamplifier suitable for infrared wireless data communications. The preamplifier consists of a differential CMOS variable-gain transimpedance amplifier embedded in a larger feedback loop used to reject photocurrents generated by ambient light. Fabricated in a commercial 0.35-μm CMOS process, the preamplifier consumes 8 mW at 3 V, and provides 70 MHz bandwidth over a 77-dB dynamic range with a maximum transimpedance gain of 19 kΩ. The bandwidth is controlled within a factor of two over a 31-dB variation in gain
Keywords :
CMOS analogue integrated circuits; data communication; differential amplifiers; feedback amplifiers; integrated optoelectronics; optical communication equipment; preamplifiers; 0.35 micron; 3 V; 70 MHz; 8 mW; CMOS optical preamplifier; ambient photocurrent rejection circuit; differential variable-gain transimpedance amplifier; feedback loop; infrared wireless data communication; Bandwidth; Data communication; Differential amplifiers; Feedback loop; Optical amplifiers; Optical feedback; Optical fiber communication; Preamplifiers; Stimulated emission; Wireless communication;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
