Input impedance of low noise preamplifiers used for MRI with dual source FET, floating ground and permanent ground
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United States of America Patent
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Sep 1, 2015
Grant Date -
Mar 15, 2012
app pub date -
May 17, 2010
filing date -
Jun 19, 2009
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Abstract
A preamplifier (46) comprises a field effect transistor (64) in common source configuration. While the gate of the field effect transistor is coupled to an amplifier input circuit (e.g. MRI coil), the drain of the field effect transistor (64) is coupled to an amplifier output. The preamplifier comprises furthermore a first (66) and a second (68) source-ground connection. The first source-ground lead (66) couples the source of the field effect transistor to the ground node of the amplifier input circuit, while the second source-ground lead (68) couples the source of the field effect transistor to the ground node of the amplifier output circuit. As a result, amplifier output currents generate basically a voltage drop across the second source-ground lead (68). Thus, the amplifier input circuit is less influenced by any common voltage drop across any common source-ground connection.
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