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This paper describes a method for mutual phase noise and spurious tones analysis of integer-N phase locked loop (PLL). With this method both contributions of individual phase noise sources and effects of parameter dimensioning, on the spectral purity, can easily be recognized. Furthermore, a transistor-level analysis example is given to clarify and to illustrate the spectral purity optimization.
Spectrum sensing is one of the most challenging task in implementing future cognitive radios. The sensing unit should provide reliable information about the surrounding radio spectrum with small delay and low power consumption. This paper presents an implementation of a spectrum sensing unit capable of performing both cyclostationary feature detection and spectrum estimation for energy detection....
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