Journal article
A time-variant analysis of the 1/f^(2) phase noise in CMOS parallel LC-Tank quadrature oscillators
This paper presents a study of 1/f2 phase noise in quadrature oscillators built by connecting two differential LC-tank oscillators in a parallel fashion. The analysis clearly demonstrates the necessity of adopting a time-variant theory of phase noise, where a more simplistic, time-invariant approach fails to explain numerical simulation results even at the qualitative level.
Two topologies of 5-GHz parallel quadrature oscillators are considered, and compact but nevertheless highly general, closed-form formulas are derived for the phase noise caused by the losses in the LC-tanks and by the noisy currents in the MOS transistors. A large number of spectreRF simulations, covering a wide range of working conditions for the oscillators, is used to validate the theoretical analysis.
| Language: | English |
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| Publisher: | IEEE |
| Year: | 2006 |
| Pages: | 1749-1760 |
| ISSN: | 15580806 and 15498328 |
| Types: | Journal article |
| DOI: | 10.1109/TCSI.2006.879011 |
1/f noise 1/f<sup>2</sup> noise 5 GHz Analytical models CMOS analogue integrated circuits Circuit noise Failure analysis Joining processes LC-tank oscillators Local oscillators MOSFETs Numerical simulation Phase noise Topology White noise integrated circuit noise microwave oscillators network analysis quadrature oscillators spectreRF simulations time-variant analysis time-varying networks
