Improved integrated oscillators and tuning circuits

摘要

An integrated Voltage controlled oscillator (VCO) includes varactors and fixed capacitors formed in a "stacked" arrangement. Forming the VCO integrated circuit by "stacking" fixed capacitors upon underlying varactors frees up semiconductor surface area for use by other circuit components or permits the implementation of a smaller integrated circuit package. "Stacking" further permits a decrease in parasitic capacitance associated with interconnections between the fixed capacitors and other components of the VCO.