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A structured design of subscriber line interface system and circuit is described. A high level synthesis allows extracting overall system and circuit requirements to satisfy the desired specifications, standards, and a robust implementation. For this purpose, first the output driving stage is analyzed and then, DC, AC, and longitudinal balance feedbacks are considered. Then based on extracted system specifications, optimum circuit design of a line-driver is described. High-level design of the line-driver as the most important circuit block optimized for stability, accuracy, area, and power dissipation is elaborated.