It is challenging to develop a physically based compact model for an organic thin-film transistor (OTFT). Moreover, there is still a lack of a universal model that would cover the huge variety of materials and device structures available for stateof-the-art OTFTs. Different models of charge transport phenomenon in organic semiconductors are briefly explained, since such phenomenon constitutes the basis of a physically based compact model of an OTFT. An introduction to the basic principles dictated on compact models suitable for Computer Aided Design (CAD) simulators is stated. Six reported models are presented and analysed with an emphasis on their primary assumptions and applicability aspects. Furthermore, the selected compact models are compared with experimental results provided by a fabricated OTFT. Finally, the authors conclude recommendations for advancing OTFT compact modelling in order to reach a more enhanced model that could characterise most recently reported OTFTs.
Multiple Bluetooth piconets are likely to co-exist in a physical environment, supporting many wireless applications. An independently operating Bluetooth piconet will inevitably encounter mutual interference from collocated piconets, which results in individual piconet and overall scatternet performance degradation. In this paper, the throughput performance of Bluetooth piconet is studied and evaluated as the number of interfering piconets is increased considering that the frequency hopping mechanism in Bluetooth piconets is not a totally random process. Several different simulations were performed with varying inter-piconet time offset in order to represent the effects of different packet sizes, symmetric / asymmetric transmission, synchronized / unsynchronized data packets, and different traffic loads with non equal probabilities of collision for different packet sizes. Results proved that certain packets sizes can achieve higher throughput depending on type, size, and number of interferers. Throughput improvement may be achieved in the presence of interference by changing the packet size in the piconet. It was also verified that an optimum traffic load could be reached to achieve maximum throughput for each number of piconets.
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