Modeling of kink-effect in RF behaviour of GaN HEMTs using ASM-HEMT model

Sheikh Aamir Ahsan, Sudip Ghosh, Sourabh Khandelwal, Yogesh Singh Chauhan

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

17 Citations (Scopus)

Abstract

In this paper, a physics-based compact model is reported that captures the kink-effect observed in S22 for AlGaN/GaN HEMTs. The presence of this kink in the Smith-plot of S22 severely affects the design of the output matching network for amplifiers based on these devices which calls for a precise consideration of this effect. The kink-effect originates due to the ambivalent nature of the output impedance of the intrinsic device, wherein it changes its nature from a low frequency series-RC network to a high frequency parallel-RC network, giving rise to a kink at the frequency where the contours corresponding to low and high frequency approximations intersect each other. The output impedance is a complicated function of the various intrinsic elements of the device small signal model, and all the device intrinsic characteristics in our model arise from a physics-based framework, therefore, making multi-bias validation of the kink-behaviour with measured data possible with sufficient ease.

Original languageEnglish
Title of host publicationEDSSC 2016
Subtitle of host publicationIEEE International Conference on Electron Devices and Solid-State Circuits : proceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages426-429
Number of pages4
ISBN (Electronic)9781509018307
DOIs
Publication statusPublished - 15 Dec 2016
Externally publishedYes
Event2016 IEEE International Conference on Electron Devices and Solid-State Circuits, EDSSC 2016 - Hong Kong, Hong Kong
Duration: 3 Aug 20165 Aug 2016

Other

Other2016 IEEE International Conference on Electron Devices and Solid-State Circuits, EDSSC 2016
CountryHong Kong
CityHong Kong
Period3/08/165/08/16

Keywords

  • GaN HEMTs
  • kink-effect
  • modeling
  • S₂₂

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