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VLSI Circuits and Systems V
This article presents a wide range inductance-capacitance voltage controlled oscillator (VCO) with a unit cells-based varactor. The unit cell represents the minimum possible integrated varactor based on p-n junction diodes, where N þ diffusions are central rectangles, surrounded by doughnut shaped P þ diffusions, with their respective contacts. The varactors are designed using the AMS 0.35 mm BiCMOS process. A physical model has been derived from the measurement of a set of eight fabricateddoi:10.1117/12.888663 fatcat:42idao4nh5hrldez343c4ktu5m