Receiver Front-End Bandwidth Enhancement Design

Abstract

This paper is concerned with a systematic approach to the design of receiver for indoor optical wireless communication. In particular, it is concerned with how one properly chooses the front-end preamplifier and biasing circuitry for the photodetector; and comparison between differences types of amplifier, and method of bandwidth enhancement. For most photodetector applications, large values of RL and CD would severely restrict bandwidth. It is shown that a proper front-end design incorporates a transimpedance preamplifier which tends to integrate the detector output. Such a design provides significant reduction in photodiode capacitance and increase bandwidth when compared to a design which does not integrate initially. The theory and design obstacles of indoor optical wireless receiver delivery in addition to techniques for mitigating these effects and shows that infrared is a viable alternative to radio for certain application is also presented.