| 摘要 |
A preamplifier for beamforming hydrophone signals of a sonar array. The invention uses an amplifier that provides a current-source type of output for driving the beamforming network, thus avoiding the substantial signal loss inherent in using voltage-source amplification. To obtain the stability of gain required in this type of operation, the invention employs a negative feedback system that can be easily adjusted by choice of resistors to accommodate desired levels of shading and signal equalization. The advantages provided are savings in cost, reduction in size and power requirements and improved in signal-to-noise ratio.
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