NDLI: An Electronically Tunable Linear or Nonlinear MOS Resistor

Content Provider	IEEE Xplore Digital Library
Author	Keng Hoong Wee Sarpeshkar, R.
Copyright Year	2004
Abstract	We present a bidirectional MOS resistor circuit that is electronically tunable and has zero dc offset. For a given I-V characteristic, the circuit senses the source-to-drain potential across an MOS device and automatically generates an appropriate bias for the gate terminal to implement the characteristic via negative feedback. We show that the I-V characteristic of the resistor can be designed to be linear, compressive or expansive by using appropriate translinear current mode circuits for the feedback biasing. Our technique does not require the MOS transistor to operate in the triode region and is valid in both weak and strong inversion. Experimental results from a CMOS process show that a square-root, linear, or square resistor can be implemented as examples of our topology. The linear version was tunable over a resistance range of 1 MOmega-100 GOmega in our particular implementation and exhibited proportional-to-absolute temperature (PTAT) behavior. The measured excess noise of the resistor agrees with theoretical predictions.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	2573
Ending Page	2583
Page Count	11
File Size	1205689
File Format	PDF
ISSN	15498328
Volume Number	55
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resistors Tunable circuits and devices Feedback circuits MOS devices Character generation Negative feedback Current mode circuits MOSFETs CMOS process Circuit topology nonlinear resistor Bulk-referenced model electronically tunable resistor MOS resistor
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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