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

Author:
Gierkink, S.L.J.   Levantino, S.   Frye, R.C.   Samori, C.   Boccuzzi, V.  


Journal:
IEEE Journal of Solid-State Circuits


Issue Date:
2003


Abstract(summary):

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


Page:
1148-1154


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