Title :
A CMOS infrared optical preamplifier with a variable-gain transimpedance amplifier
Author :
Chen, Roger Yubtzuan ; Hung, Chih-Yuan ; Hung, Tsung-Shuen
Author_Institution :
Dept. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Taiwan
Abstract :
A CMOS infrared wireless optical receiver front-end is described. A feedback analysis is carried out for the design of a stable variable-gain transimpedance feedback amplifier. A current-mode amplifier, exhibiting a low input resistance and a high output resistance, is designed. The current amplifier is employed as the feedforward gain element of a variable-gain fully-differential transimpedance feedback amplifier. For an infrared wireless optical receiver front-end employing the transimpedance amplifier, the optical preamplifier achieves a transimpedance gain of 87dBΩ, a bandwidth of 135MHz with a 5pF photodiode capacitance, and a power consumption of 28mW.
Keywords :
CMOS integrated circuits; current-mode circuits; differential amplifiers; feedback amplifiers; optical receivers; preamplifiers; 135 MHz; 28 mW; 5 pF; CMOS infrared optical preamplifier; current amplifier; current-mode amplifier; feedback amplifier; feedback analysis; feedforward gain element; fully-differential amplifier; stable variable-gain amplifier; transimpedance amplifier; transimpedance gain; wireless optical receiver front-end; Bandwidth; Feedback amplifiers; Optical amplifiers; Optical feedback; Optical receivers; Photodiodes; Power amplifiers; Preamplifiers; Semiconductor optical amplifiers; Stimulated emission;
Conference_Titel :
Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on
Print_ISBN :
0-7803-8660-4
DOI :
10.1109/APCCAS.2004.1412745
