The following paper describes a single die, integrated, monolithic, sound system. Total function includes 4.5mHz I. F. limiting and amplification, quadrature F.M. detection, external D.C. volume control, audio power and preamplification, plus an internal supply line voltage regulator. Substantial performance ance gains throughout were realized with improved circuit and device design techniques.
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C. Ring (1973) studied this question.
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