A Wide-Tuning-Range VCO with Small VCO-Gain Variation for Multi-Band W-CDMA RFIC

概要

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A wide-tuning-range LC-tuned voltage-controlled oscillator (LC-VCO) — featuring small VCO-gain (KVCO) variation — has been developed. For small KVCO variation, a serial LC-resonator that consists of an inductor, a fine-tuning varactor, and a capacitor bank was added to a conventional parallel LC-resonator that uses a capacitor bank scheme. The resonator was applied to a 3.9-GHz VCO for multi-band W-CDMA RFIC fabricated using 0.25-µm Si-BiCMOS technology. The VCO exhibited KVCO variation of only 21%, which is one third that of a conventional VCO, with a 34% tuning range. The VCO also exhibited a low phase noise of -121dBc/Hz at 1-MHz offset frequency and a low current consumption of 6.0mA.