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More on the 1/{\rm f}^{2} Phase Noise Performance of CMOS Differential-Pair LC-Tank Oscillators

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2 Author(s)
Andreani, P. ; Center for Phys. Electron., Tech. Univ. Denmark, Lyngby ; Fard, A.

This paper presents a rigorous phase noise analysis in the 1/f2 region for the differential CMOS LC-tank oscillator with both nMOS and pMOS switch pairs. A compact, closed-form phase noise equation is obtained, accounting for the noise contributions from both tank losses and transistors currents, which allows a robust comparison between LC oscillators built with either one or two switch pairs. The fabricated oscillator prototype is tunable between 2.15 and 2.35 GHz, and shows a phase noise of -144 dBc/Hz at 3 MHz offset from the 2.3 GHz carrier for a 4 mA bias current. The phase noise figure-of-merit is practically constant across the tuning range, with a minimum of 191.5 dBc/Hz. A reference single-switch-pair oscillator has been implemented and tested as well, and the difference between the phase noise levels displayed by the two oscillators is very nearly the one expected from theory

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 12 )
RFIC Virtual Journal, IEEE

Date of Publication:

Dec. 2006

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