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Flicker Noise in CMOS LC Oscillators
English
131 b
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CMOS implementations of direct conversion receivers,§the architecture §most amenable to complete monolithic integration, are§hindered by the §1/f^3 noise of the local oscillator. This work§explores sources of flicker §noise generation in the cross-coupled negative§resistance oscillator §(NMOS, PMOS, and CMOS). Prior and current work in the§area of phase §noise modeling is reviewed, including the work of§Leeson, Hajimiri, §Hegazi, and others, seeking the mechanisms by which§flicker noise is §upconverted. The work of Hajimiri is extended with a§simple hardware DC estimator for the special case of LC CMOS§oscillators. A method of §adaptive control of an oscillator core is presented,§as well, using this §estimate to maintain the condition of minimum flicker§noise §upconversion in the oscillator. A Figure of Merit§(FOM) methodology §suitable to the 1/f^3 phase noise region is also§developed. This work §will be of particular interest to practicing§engineers in RFIC design, as §well as graduate students and advanced undergraduates.
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