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Summary form only given. Single-walled carbon nanotube (CNT) films are a new class of transparent, conductive, and flexible materials, and they exhibit uniform physical and electronic properties. Several promising device applications of CNT films have recently been demonstrated, such as thin film transistors, optoelectronic devices, and chemical sensors. For many of these applications, intrinsic noise level and its scaling with device parameters is undoubtedly one of the most important figures of merit; hence they are the focus of this study.