Dense Delta-Sigma Phased Arrays

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Executive Summary

The high cost of high-resolution phase shifters required to maintain precise control over the array beam pattern in traditional phased arrays preclude their use in a variety of emerging millimeter-wave applications. The authors develop a phased array architecture that obviates the need for such precise phase shifters, based on the use of sub-half-wavelength array element spacing and novel spatial domain delta-sigma processing. They characterize the performance of this architecture in terms of the array Signal-to-Quantization-Noise Ratio (SQNR) and the array power transfer efficiency, and demonstrate a tradeoff between these two metrics.

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