A voltage-controlled oscillator for IEEE 802.11a and HiperLAN2 application

This paper presents an integrated voltage-controlled oscillator with a frequency doubler, intended for 5-to-6 GHz applications. The oscillator adopts a common-collector Colpitts topology driving a series-connected off-chip tank. This circuit demonstrates a 44% tuning range and a harmonic rejection better than 40 dB, dissipating 28mA from a 2.3V voltage supply. The phase noise at 1 MHz offset from the carrier is better than -120 dBc/Hz over the entire tuning range.

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