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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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