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A low-phase-noise 5-GHz CMOS quadrature VCO using superharmonic coupling

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5 Author(s)
S. L. J. Gierkink ; Commun. Circuits Res. Dept., Agere Syst., Allentown, PA, USA ; S. Levantino ; R. C. Frye ; C. Samori
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A new concept for quadrature coupling of LC oscillators is introduced and demonstrated on a 5-GHz CMOS voltage-controlled oscillator (VCO). It uses the second harmonic of the outputs to couple the oscillators. The technique provides quadrature over a wide tuning range without introducing any increase in phase noise or power consumption. The VCO is tunable between 4.57 and 5.21 GHz and has a phase noise lower than -124 dBc/Hz at 1-MHz offset over the entire tuning range. The worst-case measured image rejection is 33 dB. The circuit draws 8.75 mA from a 2.5-V supply.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:38 ,  Issue: 7 )