Active Inductor Designs for RF CMOS Receiver Front - End

Inductors are a necessary building block in many circuits, including LNA and oscillators largely used in Receivers and various other systems. Because planer inductors can occupy a large amount of area in integrated-circuit (IC) designs, the search has been on for smaller, tunable inductors suitable for monolithic fabrication In this paper a method, which is to implement an active inductor by CMOS active devices, has been presented. For this purpose four designs are presented using various topologies along with their simulation results. Few designs gave low to moderate values of inductance, associated capacitance and also noise figure obtained is well within the range of 1 dB with low offered resistance.