Conclusions

This paper has proposed a distortion reduction technique for active inductors. A compensation current source is introduced to cancel out a distortion caused by nonlinearity of a MOSFET. The proposed technique can realize with only a few additional MOSFETs because a bias current source in the conventional active inductor is used as a compensation current source. Low distortion active inductors based on a proposed technique have been introduced. Thanks to the proposed technique THD of the proposed active inductor is much smaller than that of conventional one. One of the proposed low distortion active inductors is applied to a 2nd order bandpass filter. The total harmonic distortion of the bandpass filter becomes 0.26% at 1 GHz.