NDLI: CMOS Active Inductor Linearity Improvement Using Feed-Forward Current Source Technique

Content Provider	IEEE Xplore Digital Library
Author	Chun-Lee Ler A'ain, A. Kordesch, A.V.
Copyright Year	1963
Abstract	MOSFET drain current second-order nonlinearity has a significant impact on the linearity of current regulated CMOS active inductors. It tends to compress MOSFET transconductance (g _m) by generating excess dc current (I _EX) in the channel, which is a function of incoming input signal amplitude. This generated excess dc current can change the original dc operating point of the current regulated CMOS active inductor, and thus, influence the inductance. Unfortunately, MOSFET drain current second-order nonlinearity contributes more to MOSFET g _m compression than MOSFET drain current third-order nonlinearity. In this paper, a new technique known as feed-forward current source (FFCS) has been proposed to improve the linearity of the active inductor. The proposed FFCS technique makes use of the second-order nonlinear property of a MOSFET that generates I _EX when an input ac signal is applied. The generated I _EX is then fed-forward to the current source of the active inductor to drain out the I _EX in the active inductor. This prevents the dc operating point from shifting and improves its inductance linearity. Single-ended and differential active inductors with the proposed FFCS circuit have been fabricated using Silterra's CMOS 0.18-mum technology to verify the proposed technique.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	1915
Ending Page	1924
Page Count	10
File Size	1214177
File Format	PDF
ISSN	00189480
Volume Number	57
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Active inductors Linearity Feedforward systems MOSFET circuits Flexible electronics DC generators Signal generators Inductance CMOS technology Transconductance linearity CMOS integrated circuits gyrators
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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