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Wide tunable CMOS active inductor

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3 Author(s)
Reja, M.M. ; Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB ; Filanovsky, I.M. ; Moez, K.

A tunable CMOS active inductor is presented. The circuit uses a cross-coupled pair of transistors providing positive feedback for enhanced quality factor. The circuit is biased with a controllable current source varying the feedback and tuning the inductor. The proposed inductor is designed and simulated in a 90 nm digital CMOS process. It shows a wide-frequency range inductive impedance and a very high resonance frequency. By cascading two inductors, a wideband filter/amplifier is designed to characterise the inductor performance.

Published in:

Electronics Letters  (Volume:44 ,  Issue: 25 )

Date of Publication:

December 4 2008

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