Narrowband Phased Array Preamplifier Design Using an Integrated SAW Filter

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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