Two-bit Analog to Digital Converter based on Acoustic Directional Coupler

Abstract

Abstract This study explores the novel application of a solid-state phononic crystal (PnC)-based analog-to-digital converter (ADC). To ensure a ripple-free output, a coupler is utilized, enabling 2-bit quantization. As the input amplitude increases, the structure exhibits non-linear behavior. This non-linearity emerges from an augmented displacement gradient, resulting in a corresponding alteration in mass density. The phononic crystal matrix consists of a 13×20 array of iron rods embedded within a PMMA host material. The system operates at a frequency of 67.5 kHz. A directional coupler is utilized to direct the emitted wave. For the designed model, we have considered transmission less than 0.3 to be logically equivalent to "0" and more than that to be logically equivalent to "1". Also, in order for both outputs to be on, transmission from 0.4 to 0.6 is equivalent to " 1" we have considered. The manufacturing tolerance of the converter is 0.03.