Publication: Noise figure characterization of preamplifiers at NMR frequencies
Noise figure characterization of preamplifiers at NMR frequencies
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Nordmeyer-Massner, J. A., De Zanche, N., & Pruessmann, K. P. (2011). Noise figure characterization of preamplifiers at NMR frequencies. Journal of Magnetic Resonance Imaging (JMRI), 210(1), 7–15. https://doi.org/10.1016/j.jmr.2011.01.025
Abstract
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A method for characterizing the noise figure of preamplifiers at NMR frequencies is presented. The noise figure of preamplifiers as used for NMR and MRI detection varies with source impedance and with the operating frequency. Therefore, to characterize a preamplifier's noise behavior, it is necessary to perform noise measurements at the targeted frequency while varying the source impedance with high accuracy. At high radiofrequencies, such impedance variation is typically achieved with transmission-line tuners, which however are not a
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- Nordmeyer-Massner, J A
- De Zanche, N
- Pruessmann, K P
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Nordmeyer-Massner, J. A., De Zanche, N., & Pruessmann, K. P. (2011). Noise figure characterization of preamplifiers at NMR frequencies. Journal of Magnetic Resonance Imaging (JMRI), 210(1), 7–15. https://doi.org/10.1016/j.jmr.2011.01.025
