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A radio-frequency CMOS active inductor and its application in designing high-Q filters

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5 Author(s)
Haiqiao Xiao ; Dept. of Electr. & Comput. Eng., Portland State Univ., OR, USA ; Schaumann, R. ; Daasch, W.R. ; Wong, P.K.
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An all-transistor CMOS active inductor with a self-resonance frequency fR=5.7 GHz is presented. Large fR is achieved by forming an all-NMOS signal path. The measured quality factor, Q, is as high as 665, but Q can be infinite theoretically. Both fR and Q are tunable via biasing and on-chip varactors. As an example for using the active inductor, a high-Q bandpass filter for radio-frequency applications is designed. The inductor circuit was implemented in TSMC 0.18-μm standard digital CMOS technology and occupies an area of 26.6 μm×30 μm including double guardrings. For a supply voltage of 1.8 V, the circuit consumes 4.4 mW, and IIP3 is measured at Vpp=270 mV.

Published in:

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on  (Volume:4 )

Date of Conference:

23-26 May 2004

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