一种带可变增益跨阻放大器的CMOS红外光学前置放大器

The 2004 IEEE Asia-Pacific Conference on Circuits and Systems, 2004. Proceedings. Pub Date : 2004-12-06 DOI:10.1109/APCCAS.2004.1412745

R. Y. Chen, Chih-Yuan Hung, Tsung-Shuen Hung

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引用次数: 6

摘要

介绍了一种CMOS红外无线光接收机前端。对稳定变增益跨阻反馈放大器的设计进行了反馈分析。设计了一种具有低输入电阻和高输出电阻的电流型放大器。采用电流放大器作为变增益全差分跨阻反馈放大器的前馈增益元件。对于采用跨阻放大器的红外无线光接收机前端，光前置放大器的跨阻增益为87dB/spl Omega/，带宽为135MHz，光电二极管电容为5pF，功耗为28mW。

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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 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.

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The 2004 IEEE Asia-Pacific Conference on Circuits and Systems, 2004. Proceedings.

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