Abstract
Improved image quality requires the use of matrix (n×m) arrays with a thousand or more elements. As element numbers increase and their dimensions grow smaller, limitations to present fabrication technologies arise. Cost, ergonomics, produceability, and reliability are important issues. Signal loss due to the capacitance of interconnecting coax cables becomes a fundamental problem. Connecting an integrated circuit directly to the array elements alleviates all these problems. Each unit cell of such a custom transmitter/receiver integrated circuit (TRIC) may have high voltage switches for transmitting; a preamplifier which minimizes signal loss due to capacitance in coax cables and a multiplexer to send the array signals over fewer wires. Additional signal processing and beam forming may also be included. Issues with currently available arrays are reviewed. The new technology for direct connection of arrays to IC’s is described. The paper concludes with speculation about future possibilities of this approach.
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