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 |
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| 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 |
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| Location | Paris Expo Porte de Versailles |
| Country | France |
| City | Paris |
| Period | 16/06/2018 → 21/06/2018 |
| Internet address |
Cite this
Johansen, D. H., Sánchez-Heredia, J. D., Zhurbenko, V., & Ardenkjær-Larsen, J. H. (2018). Accurate Noise Figure Measurements for Highly Mismatched Preamplifiers. Paper presented at Joint Annual Meeting ISMRM-ESMRMB 2018, Paris, France.