Abstract #0547
A Comparison of Isolating Amplifier Architectures
Neal Hollingsworth 1 , Katherine Moody 1 , Jon-Fredrik Nielsen 1 , Douglas Noll 1 , Mary Preston McDougall 1,2 , and Steven Wright 1,2
1
Electrical Engineering, Texas A&M
University, College Station, Texas, United States,
2
Biomedical
Engineering, Texas A&M University, College Station,
Texas, United States
Transmit systems have historically been single channel
and used to excite a simple slice or slab, however the
desire to use spatially selective RF pulses has driven
an interest in using the Transmit SENSE to accelerate
excitation. This requires the array to have known and
stable patterns, but coupled arrays are sensitive to
varying loads. Current source and low output impedance
amplifiers have been suggested for decoupling transmit
arrays. We have constructed current source, ultra-low
output impedance, and standard power amplifiers to
investigate the strengths of different architectures by
comparing the peak-power and isolation of the different
amplifier architectures.
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