Abstract #1331
Cartesian Feedback Configuration with Direct RF Signal Injection for Power Amplifier Linearization at 1.5T MRI
Jonathan Y Lu 1 , Pascal P. Stang 1 , John M. Pauly 1 , Marta G. Zanchi 2 , and Greig C. Scott 1
1
Dept of Electrical Engineering, Stanford
University, Stanford, CA, United States,
2
School
of Medicine, Stanford University, Stanford, CA, United
States
We demonstrate a modified version of Cartesian feedback,
an RF power amplifier linearization technique, for use
at 1.5T. In this feedback configuration, the MRI RF
signal is directly injected at a point in the feedback
loop that allows us to eliminate the initial
down-converter needed to convert the MRI signal to
baseband or intermediate frequency. Amplifier
linearization is important especially in multichannel
transmit where unpredictable coil loading conditions can
affect amplifiers in the stage before, while this
particular arrangement allows appreciable components
savings and simplification in architecture when multiple
coils are used.
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