Phase Locked Loop Systems Design for Wireless Infrastructure Applications

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  • Author: Jun Lee
Base stations use phase locked loop (PLL) systems to generate either RF or IF local signals to up-convert baseband signals to RF signals or vice versa. There are different ways of integrating PLL system blocks, including voltage-controlled oscillators (VCO), based on system requirements, performance and material cost. Why PLL performance is critical in wireless system design will be determined first, followed by a comparison of high level integrations. Detailed analytical approaches will be used to predict the baseline performance for synthesizer systems, using linear models of phase noise analysis in a closed loop, as well as overall system performance optimization, including loop filter designs.