RF Front-end System Gain and Linearity Built-in Test
VTS '06 Proceedings of the 24th IEEE VLSI Test Symposium
Integrated CMOS Power Sensors for RF BIST Applications
VTS '06 Proceedings of the 24th IEEE VLSI Test Symposium
Electronic tracking for wireless infrared communications
IEEE Transactions on Wireless Communications
BER Performance of Free-Space Optical Transmission with Spatial Diversity
IEEE Transactions on Wireless Communications
High-speed integrated transceivers for optical wireless
IEEE Communications Magazine
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This paper presents a low-power imaging diversity front-end receiver employing the maximum-ratio-combining algorithm for free-space optical communication. It consists of seven signal channels and an output stage, each channel has a front-end transimpedance amplifier, a signal-to-noise ratio (SNR) estimator and a variable gain amplifier (VGA). The imaging receiver circuit was implemented in a 90 nm CMOS process. The maximum-ratio weighting is achieved with the SNR estimator and variable gain amplifier (VGA), which provides the signal with a gain proportional to the signal amplitude. The maximum ratio combining feature was demonstrated with two channels driven by photodiode emulation circuits for electrical characterization. The power dissipation for the whole chip is 43 mW from a single 1.2 V supply.