A CMOS infrared optical preamplifier with a variable-gain transimpedance amplifier

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 amplifie...

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Bibliographic Details
Main Authors: Chen, R.Y., Chih-Yuan Hung, Tsung-Shuen Hung
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Feedback amplifiers
Optical amplifiers
Optical feedback
Optical receivers
Photodiodes
Power amplifiers
Preamplifiers
Semiconductor optical amplifiers
Stimulated emission
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Description
Summary: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 87dB/spl Omega/, a bandwidth of 135MHz with a 5pF photodiode capacitance, and a power consumption of 28mW.
DOI:10.1109/APCCAS.2004.1412745