P3G-5 Distortion-Free Delta-Sigma Beamforming with Dynamic Delays

We have specified a new system for a compact digital delay-and-sum beamformer using delta-sigma A/D converters. The new design allows for dynamic (time variant) delays to be introduced prior to delta-sigma demodulation without disrupting modulator-demodulator synchronization, as applying delays in this order is important to achieve a compact implementation. Our new method is based on a description of how dynamic delays disrupt delta-sigma demodulation, which yields some new insights and a new understanding of earlier suggested methods for reducing distortion in such systems