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noise parameters of the low noise amplifier in MRI system??

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dannice

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I need the noise parameters of the low noise amplifier in magnetic resonance imaging system? Anybody know how to get it? i could not find them from the datasheet of the product. What i need to know are:
• Equivalent noise resistance Rn (related to noise voltage source)
• Equivalent noise conductance Gn (related to noise current source)
• Correlation admittance Yr
• Scattering matrix or impedance matrix

Thanks.
 

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