A new small-signal MOSFET model and parameter extraction method for RF IC's application

Kow-Ming Chang*, Han Pang Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


In this paper, an accurate and simple small signal model of RF MOSFETs accounting for the distributed gate effect, the substrate parasitics and charge conservation is proposed. Meanwhile, a direct and accurate extraction method using linear regression approach for the components of the equivalent circuit of the MOSFET with S-parameters analysis is also proposed. The proposed model and extraction method are verified with the experimental data and an excellent agreement is obtained up to 10GHz. The extraction results from the measured data for various bias conditions are presented. Also, the extracted parameters, such as transconductance gm, match well with those obtained from DC measurements. Besides, it is shown that a significant error in circuit performances would be found if the charge conservation is not properly considered.

Original languageAmerican English
Pages (from-to)749-759
Number of pages11
JournalMicroelectronics Journal
Issue number9
StatePublished - 1 Sep 2004


  • Gate resistance
  • Nonreciprocal capacitance
  • RF MOSFET modeling
  • Substrate resistance

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