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Proceedings Paper

Empirical model of the metal losses in integrated inductors
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Paper Abstract

Integrated inductors are key components in Radio Frequency Integrated Circuits (RFICs) because they are needed in several building blocks, such as voltage-controlled oscillators (VCOs), low-noise amplifiers (LNAs), mixers, or filters. The cost reduction, achieved in the circuit assemblage, makes them preferable to Surface Mounted Devices in spite of the different sources of lost that limits the use of integrated inductors; there are losses associated with the semiconductor substrate, and losses in the metals. We report, in this work, our research in modeling integrated inductors, particularly the losses in the metals. The model is derived from measurements taken from integrated spiral inductors designed and fabricated in a standard silicon process. The measurements reveal that the widely accepted lumped equivalent model does not properly predict the integrated inductor behavior at frequencies above 3 GHz for our technology. We propose a simple modification in the lumped equivalent circuit model: the introduction of an empirical resistor in the port 1-to-port 2 branch of the equivalent circuit. As a result, it will be demonstrated that the integrated inductor behavior is adequately predicted in a wider frequency range than does the conventional model. We also report a new methodology for characterizing the integrated inductors including the new resistor. In addition, the new model is used to build-up an integrated inductor library containing optimized integrated inductors.

Paper Details

Date Published: 21 April 2003
PDF: 9 pages
Proc. SPIE 5117, VLSI Circuits and Systems, (21 April 2003); doi: 10.1117/12.501210
Show Author Affiliations
F. Javier del Pino, Univ. de Las Palmas de Gran Canaria (Spain)
Javier Garcia, Univ. de Las Palmas de Gran Canaria (Spain)
Benito Gonzalez, Univ. de Las Palmas de Gran Canaria (Spain)
Jose Ramón Sendra, Univ. de Las Palmas de Gran Canaria (Spain)
Antonio Hernandez, Univ. de Las Palmas de Gran Canaria (Spain)
Andres Garcia-Alonso, Ctr. de Investigaciones Tecnicas de Guipuzcoa (Spain)
Antonio Nunez, Univ. de Las Palmas de Gran Canaria (Spain)

Published in SPIE Proceedings Vol. 5117:
VLSI Circuits and Systems
Jose Fco. Lopez; Juan A. Montiel-Nelson; Dimitris Pavlidis, Editor(s)

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