Accurate Noise Figure Measurements for Highly Mismatched Preamplifiers

Daniel Højrup Johansen; Juan D. Sánchez-Heredia; Vitaliy Zhurbenko; Jan Henrik Ardenkjær-Larsen

Accurate Noise Figure Measurements for Highly Mismatched Preamplifiers

Daniel Højrup Johansen, Juan D. Sánchez-Heredia, Vitaliy Zhurbenko, Jan Henrik Ardenkjær-Larsen

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Abstract

A method reducing the uncertainty of noise figure measurements of highly mismatched preamplifiers is presented. In many cases when measuring the noise figure of preamplifiers for MRI receive arrays the uncertainty is approximately ±0.4 dB. Since the noise figure of the preamplifier is also in this range, a more accurate method is needed. Here we show an increase of 59 % in noise figure accuracy by adding an attenuator between the noise source and preamplifier.

Original language	English
Publication date	2018
Number of pages	2
Publication status	Published - 2018
Event	Joint Annual Meeting ISMRM-ESMRMB 2018 - Paris Expo Porte de Versailles, Paris, France Duration: 16 Jun 2018 → 21 Jun 2018 https://www.ismrm.org/18m/

Conference

Conference	Joint Annual Meeting ISMRM-ESMRMB 2018
Location	Paris Expo Porte de Versailles
Country/Territory	France
City	Paris
Period	16/06/2018 → 21/06/2018
Internet address	https://www.ismrm.org/18m/

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ISMRM18 1692 NoiseFinal published version, 2.11 MB

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title = "Accurate Noise Figure Measurements for Highly Mismatched Preamplifiers",

abstract = "A method reducing the uncertainty of noise figure measurements of highly mismatched preamplifiers is presented. In many cases when measuring the noise figure of preamplifiers for MRI receive arrays the uncertainty is approximately ±0.4 dB. Since the noise figure of the preamplifier is also in this range, a more accurate method is needed. Here we show an increase of 59 % in noise figure accuracy by adding an attenuator between the noise source and preamplifier.",

author = "Johansen, {Daniel H{\o}jrup} and S{\'a}nchez-Heredia, {Juan D.} and Vitaliy Zhurbenko and Ardenkj{\ae}r-Larsen, {Jan Henrik}",

year = "2018",

language = "English",

note = "Joint Annual Meeting ISMRM-ESMRMB 2018 ; Conference date: 16-06-2018 Through 21-06-2018",

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T1 - Accurate Noise Figure Measurements for Highly Mismatched Preamplifiers

AU - Johansen, Daniel Højrup

AU - Sánchez-Heredia, Juan D.

AU - Zhurbenko, Vitaliy

AU - Ardenkjær-Larsen, Jan Henrik

PY - 2018

Y1 - 2018

N2 - A method reducing the uncertainty of noise figure measurements of highly mismatched preamplifiers is presented. In many cases when measuring the noise figure of preamplifiers for MRI receive arrays the uncertainty is approximately ±0.4 dB. Since the noise figure of the preamplifier is also in this range, a more accurate method is needed. Here we show an increase of 59 % in noise figure accuracy by adding an attenuator between the noise source and preamplifier.

AB - A method reducing the uncertainty of noise figure measurements of highly mismatched preamplifiers is presented. In many cases when measuring the noise figure of preamplifiers for MRI receive arrays the uncertainty is approximately ±0.4 dB. Since the noise figure of the preamplifier is also in this range, a more accurate method is needed. Here we show an increase of 59 % in noise figure accuracy by adding an attenuator between the noise source and preamplifier.

M3 - Paper

T2 - Joint Annual Meeting ISMRM-ESMRMB 2018

Y2 - 16 June 2018 through 21 June 2018

ER -

Accurate Noise Figure Measurements for Highly Mismatched Preamplifiers

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