Abstract #0924
Narrowband Phased Array Preamplifier Design Using an Integrated SAW Filter
Stephen Dodd 1 , Chunqi Qian 1 , Joseph Murphy-Boesch 1 , and Alan Koretsky 1
1
Laboratory of Functional and Molecular
Imaging, NINDS, National Institutes of Health, Bethesda,
MD, United States
A cascode-type preamplifier was modified by integrating
a narrowband SAW filter into its output section to
minimize out-of-band gain. Minimal deterioration in the
noise figure was observed, along with some loss in gain
due to the insertion loss of the filter. A two-element
array was tested using the preamplifiers, which
demonstrated a reduction in out-of-band gain for the
split peaks normally observed from the phased-array
circuit. Images acquired at 11.7T show no deterioration
in image quality from the modified preamplifiers.
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