A 5Gb/s 7-Channel Current-mode Imaging Receiver Front-end for Free-Space Optical MIMO

被引：14

作者：

Zeng, Juan ^{[1
]}

Joyner, Valencia ^{[1
]}

Liao, Jun ^{[2
]}

Deng, Shengling ^{[2
]}

Huang, Zhaoran ^{[2
]}

机构：

[1] Tufts Univ, Dept Elect & Comp Engn, Medford, MA 02155 USA

[2] Rensselaer Polytech Inst, Dept Elect Comp & Syst Engn, Troy, NY 12180 USA

来源：

2009 52ND IEEE INTERNATIONAL MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1 AND 2 | 2009年

基金：

美国国家科学基金会;

关键词：

COMMUNICATION;

D O I：

10.1109/MWSCAS.2009.5236130

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

A 7-channel diversity receiver front-end based on current-summing for broadband free-space optical (FSO) MIMO communication is presented in this paper. This diversity receiver is designed for flip-chip bonding to a custom InGaAs metal-semiconductor-metal (MSM) photodetector array. Each channel employs a low input-impedance current mirror (CM) as the input stage, which allows the implementation of direct current-summing for equal-gain combining (EGC). The summed-up current signal drives a second stage transimpedance amplifier (T1A) to generate the output voltage. Implemented in an 180 nm CMOS technology, a total gain of 58.5 dB, and -3dB bandwidth of 3.7 GHz for 0.25 pF photodiode capacitance is achieved. The power consumption for a single front-end amplifier circuit is 4.2 mW, and for the second stage TIA is 10.3mW with a single 1.8V supply.

引用

页码：148 / +

页数：2

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