Abstract #1334
Analysis of Gain and Noise Relationship in RF Feedback Power Amplifier Linearization for Use 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 analyze the possibility of improving noise in an RF
Cartesian feedback system, a power amplifier
linearization technique, for use at 1.5T MRI. This
involves reducing the amount of attenuation in the
feedback path without changing the open loop gain of the
system and would entail essentially moving the RF input
location in our feedback loop. While gain was reduced,
we observed a reduction in noise for the same output
voltage. This suggests that by driving a closed loop
system with reduced gain at higher input power, we could
achieve a linear output with reduced noise.
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