Experimental Comparison of Phase Noise in Cross-Coupled RC- and LC-Oscillators

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Relaxation RC-oscillators are notorious for their poor phase-noise performance. However, there are reasons to expect a phase-noise reduction in quadrature oscillators obtained by cross-coupling two relaxation oscillators. We present measurements on 5 GHz oscillators, which show that in RC-oscillators the coupling reduces both the phase-noise and quadrature error, whereas in LC-oscillators the coupling reduces the quadrature error, but increases the phase-noise. A comparison using standard figures of merit indicates that quadrature RC-oscillators may be a viable alternative to LC-oscillators when area and cost are to be minimized.
Original languageUnknown
Pages (from-to)681-688
JournalInternational Journal of Circuit Theory and Applications
Issue number7
Publication statusPublished - 1 Jan 2009

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