Low Voltage CMOS Active Inductor with Bandwidth and Linearity Improvement

In this work a current regulated CMOS active inductor is proposed using dynamic threshold MOS transistor (DTMOS). The proposed active inductor is based on the gyrator-C approach with positive transconductance stage realized by DTMOS. The bandwidth and linearity of proposed inductor is improved using a new approach. The proposed approach is based on simultaneous use of inductive peaking and feed-forward current source technique Simulated result shows that DTMOS in the proposed circuit gives a high linearity in the active inductor´s characteristics and a bandwidth extension ratio of 3.5 is achieved. The proposed circuit has been designed using the TSMC 180nm technology node at 1V supply to prove the validity of the concept.