Estimating noise figure of matching networks for low-input-impedance preamplifiers

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Abstract

The noise figure of a matching network between a receive coil and a preamplifier with low input impedance can be estimated using relationship F ≈ 1 + R11/RC. It is demonstrated how to use this relationship to choose optimal matching-decoupling network topology in terms of signal-to noise ratio (SNR). The formula serves as an efficient tool to estimate noise figure of matching networks and is useful in low-field and high-coil-Q applications, where the noise of the matching network becomes comparable to coil noise.
Original languageEnglish
Title of host publicationProceedings of the 2023 ISMRM
Number of pages3
Volume31
PublisherThe International Society for Magnetic Resonance in Medicine
Publication date2023
Article number3905
Publication statusPublished - 2023
Event2023 ISMRM & ISMRT Annual Meeting & Exhibition - Metro Toronto Convention Centre (MTCC), Toronto, Canada
Duration: 3 Jun 20238 Jun 2023
Conference number: 32

Conference

Conference2023 ISMRM & ISMRT Annual Meeting & Exhibition
Number32
LocationMetro Toronto Convention Centre (MTCC)
Country/TerritoryCanada
CityToronto
Period03/06/202308/06/2023
SeriesInternational Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition. Proceedings
ISSN1524-6965

Keywords

  • RF Arrays & Systems
  • Matching

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