A CMOS active inductor based digital and analog dual tuned voltage-controlled oscillator

A fully integrated 600MHz CMOS active inductor based voltage-controlled oscillator (VCO) is presented. The active floating inductor configuration employs voltage differencing transconductance amplifier as a building block. In the proposed circuit topology, frequency tuning is realized by varying the bias current of the tunable inductor. The designed VCO achieves an output frequency of 450-750MHz, resulting in the tuning range of 50%. The simulated phase noise lies within -92.37 to -86.16 dBc/Hz at 1MHz offset and the VCO draws 426.98-1100 mu W from a 1V supply voltage. The proposed RF oscillator is designed and implemented in a 45-nm CMOS process and its performance is estimated using Virtuoso Analog Design Environment of Cadence.