A Low-Phase-Noise 5GHz Quadrature CMOS VCO using Common-Mode Inductive Coupling
نویسندگان
چکیده
A new concept for quadrature coupling of LC oscillators is introduced and demonstrated on a 5GHz CMOS VCO. It uses injection-locking through commonmode inductive coupling to enforce quadrature. The technique provides quadrature over a wide tuning range without introducing any phase noiseor power consumption increase. The realized VCO is tunable between 4.6GHz and 5.2GHz and measures a phase noise lower than –124dBc/Hz at 1MHz offset over the entire tuning range. The circuit draws 8.75mA from a
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