X-Parameter Characterization of TC SAW Filters with Enhanced Dynamic Range

Wolfgang Akstaller, Christian Musolff, Robert Weigel, Amelie Hagelauer

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Increasing the integration of radio frequency frontend modules for mobile communication devices results in rising power densities within the components. Additionally, advanced communication techniques demand for more frequency bands to be supported. As a result, the probability of significant nonlinear emissions disturbing adjacent channels increases, and accurate modeling of the device's response is required. The X-parameter-based modeling approach can be applied to this problem. In this paper, a measurement setup, which is based on a nonlinear vector network analyzer, is utilized in order to characterize a surface acoustic wave (SAW) filter. Due to the low power levels of the generated higher order harmonics and the demand for a power sweep, a high dynamic range (DR) is required. The application of frequency selective attenuators enables an increase of the effective DR by more than 40 dB. Based on this improved measurement setup, single-tone and two-tone X-parameter models of the SAW filter are created and evaluated for their ability to predict intermodulation distortion (IMD). Classic, scalar IMD measurements are used as a reference for the assessment of capabilities and limitations of both X-parameter approaches.

Original languageEnglish
Article number8054729
Pages (from-to)4541-4549
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Volume65
Issue number11
DOIs
StatePublished - Nov 2017
Externally publishedYes

Keywords

  • Intermodulation distortion (IMD)
  • X-parameter
  • nonlinearity
  • surface acoustic wave (SAW) filter

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