A High Performance CMOS Active Inductor

VLSI

A novel approach of CMOS active inductor, which can improve the quality factor and tuning range, was presented in this paper. A cascode grounded active inductor circuit topology and current mirror technique was presented, which can substantially improve its equivalent inductance, quality factor and tuning range. Further improvement in quality factor and inductance can be achieved by use of negative feedback network with cascode active inductor. These two active inductors were implemented by using 0.18-μm CMOS technology in cadence virtuoso IC6.1.6.Cascode active inductor design demonstrates a maximum quality factor 2.5k ,inductance 11.1nH at 4.9GHz and wide tuning range (6MHz-8GHz). The dc power consumption of this active inductor is 3.2mW. And negative feedback network-cascode active inductor design demonstrates a maximum quality factor 10k, inductance 18.29nH and wide tuning range (6.68 MHz-6.31 GHz). The dc power consumption of this active inductor is 4.1mW.

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