A new highly-scalable equivalent circuit model for on-chip symmetrical transformer with accurate substrate modeling

A new equivalent circuit model for on-chip symmetrical transformers is presented with all the model elements driven from fabrication specifications. Two extra coupled transformer loops are developed for each coil to calculate the parameters of skin effect, proximity effect and reflective effect of substrate eddy current respectively. Model accuracy is demonstrated by comparing simulated and measured S-parameters, coils inductance, coupling coefficient, and maximum available gain over a wide range of geometry configuration.

[1]  C. Tsui,et al.  A physical analytical model of multilayer on-chip inductors , 2005, IEEE Transactions on Microwave Theory and Techniques.

[2]  J.R. Long,et al.  Monolithic transformers for silicon RF IC design , 2000, IEEE Journal of Solid-State Circuits.

[3]  T. Kamgaing,et al.  Broadband compact models for transformers integrated on conductive silicon substrates , 2004, 2004 IEE Radio Frequency Integrated Circuits (RFIC) Systems. Digest of Papers.

[4]  Songcheol Hong,et al.  K- and Q-bands CMOS frequency sources with X-band quadrature VCO , 2005 .

[5]  David J. Allstot,et al.  Monolithic transformers and their application in a differential CMOS RF low-noise amplifier , 1998, IEEE J. Solid State Circuits.

[6]  E. Kerherve,et al.  Modeling and Characterization of On-Chip Transformers for Silicon RFIC , 2007, IEEE Transactions on Microwave Theory and Techniques.

[7]  T. Biondi,et al.  Analysis and modeling of layout scaling in silicon integrated stacked transformers , 2006, IEEE Transactions on Microwave Theory and Techniques.

[8]  D. P. Neikirk,et al.  Compact equivalent circuit model for the skin effect , 1996, 1996 IEEE MTT-S International Microwave Symposium Digest.

[9]  M. V. Schneider,et al.  Microstrip lines for microwave integrated circuits , 1969 .

[10]  Jeong-Geun Kim,et al.  K- and Q-bands CMOS frequency sources with X-band quadrature VCO , 2005, IEEE Transactions on Microwave Theory and Techniques.