A Technique for Extracting Small-Signal Equivalent-Circuit Elements of HEMTs

Man-Young JEON  Byung-Gyu KIM  Young-Jin JEON  Yoon-Ha JEONG  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.11   pp.1968-1976
Publication Date: 1999/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High-Frequency/High-Speed Devices for Information and Communication Systems in the 21st Century)
Category: Low Power-Consumption RF ICs
parameter extraction,  HEMT characterization,  equivalent-circuit,  cold HEMT,  

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We propose a new technique that is able to extract the small-signal equivalent-circuit elements of high electron mobility transistors (HEMTs) without causing any gate degradation. For the determination of extrinsic resistance values, unlike other conventional techniques, the proposed technique does not require an additional relationship for the resistances. For the extraction of extrinsic inductance values, the technique uses the R-estimate, which is known to be more robust relative to the measurement errors than the commonly used least-squares regression. Additionally, we suggest an improved cold HEMT model that seems to be more general than conventional cold HEMT models. With the use of the improved cold HEMT model, the proposed technique extracts the extrinsic resistance and inductance values.