A CMOS-based light modulator for contactless data transfer: theory and concept

A CMOS-based light modulator for contactless data transfer: theory and concept
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用于非接触式数据传输的基于 CMOS 的光调制器:理论和概念

DOI:
10.1117/12.873863
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发表时间:
2011
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通讯作者:
Serb A
Serb A
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Serb A

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正在开发一种新技术,该技术与使用商业上可获得的cmos技术的光学非接触式芯片对板通信有关。其主要概念是使用来自小型LED的中红外光,它将从底部进入IC,照射到一个或多个pn结,并被金属片反射,从而落在外部的分立光电探测器上。光在掺杂半导体中传播后,由于自由载流子吸收而发生衰减。通过改变pn结(S)的反向偏置,可以改变耗尽区的宽度,从而实现对光强的调制。通过该方案,可以光学地实现数据读出,从而减少了对电触点(最明显的是线键合)的需求。
A new technique pertaining to the optical contactless chip-to-board communication using a commercially available CMOS technology is under development. The main concept is to use mid-IR light from a small LED which will enter an IC from the underside, impinge upon one or more pn-junctions and be reflected by a metallic sheet so that it falls on an external, discrete photodetector. After propagation through the doped semiconductor, the light undergoes attenuation due to free carrier absorption. By varying the reverse bias across the pn-junction(s), the depletion region widths are changed and therefore modulation of light intensity can be achieved. Through this scheme, data readout can be realized optically, thus alleviating the need for galvanic contacts (most notably wirebonds).
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