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The rapidly evolving trend for increased data rates in today’s and future cellular communication systems poses extreme difficulties for developers of cellular transceivers. A multitude of standards ranging from legacy 2G to the upcoming, yet to be defined, 5G needs to be supported across a broad but fragmented frequency spectrum. Higher data throughput necessitates higher bandwidths, increased number...
An open-loop feedback-less CMOS quadrature (I/Q) local oscillator (LO) signal generator is presented. The circuit generates differential 90° shifted LO outputs from a differential input LO at the very same frequency. The phase accuracy of the implemented circuit relies on the matching of two delays and linear phase interpolation. The presented circuit is designed in a 28 nm bulk-CMOS technology...
A circuit architecture to generate differential CMOS quadrature (I/Q) local oscillator (LO) signals from a differential input at the same frequency is presented. The phase accuracy of the proposed architecture relies on the matching of two delays and linear phase interpolation. The feasibility of this approach is demonstrated by implementing an I/Q generator covering the operating frequency range...
Teaching wireless sensor networks (WSNs) only theoretically is not sufficient to understand the complex interaction of these networks. WSNs consist of sensor nodes which measure physical quantities of their environment, preprocess the measured data, and transmit it towards a base station in a multi-hop manner. WSNs are typically used in application areas without wired infrastructure and so they must...
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