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HDMI is the de facto global standard for connecting HD components and bridging the gap between consumer electronics and personal computer products, making it a priority to develop efficient hand-held, battery-powered units that support the standard.This is a study into how to design a low power and high performance system that can transmit HDMI-signals to a valid HDMI-receiver. The main priority is to implement the TMDS part of a HDMI-transmitter, where parallel data is encoded and serialized at high frequencies. The theory chapters provides an orderly summary of the complex workings of the HDMI-standard, in addition to an introduction to high-performance digital circuit design. This is followed by a system specification chapter, which sets the constraints of the design and discusses the hardware requirements. The subsequent chapter first deals with the design of a straightforward, basic HDMI-transmitter, before moving on to an enhanced design process. The basic design is used as a base for discussions in regard to how effective the suggested enhancement techniques are. The improvements result in an enhanced design able to operate at 742,5 MHz and support High-Definition video at the impressive resolution of 1080p30. This is achieved by using a 180nm, low-leakage library, and the final design consists of approximately 24.000 unit-sized transistor equivalents, consuming approximately a total of 13,6 mW.