128-Channel Multi-Chip Acoustic Hologram Generator

An ASIC combines a numerically controlled oscillator with reconfigurable amplitude and phase control of 16 channels to synthesize acoustic holograms with a phased array of ultrasonic transmitters. Multiple chiplets operate synchronously to drive arbitrarily many channels. A scalable digital delay line technique, leveraging on-chip SRAM and single-bit noise-shaped bitstreams, realizes area-efficient, high-density, and high-resolution true-time-delay phase shifts. The prototype system employs 8 chiplets to drive a 128-element array for hologram generation.