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A CMOS optical preamplifier for wireless infrared communications

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2 Author(s)
Khoman Phang ; Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada ; D. A. Johns

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

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IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing  (Volume:46 ,  Issue: 7 )