Unleashing Dynamic Range and Resolution in Unlimited Sensing Framework via Novel Hardware

TL;DR

This paper introduces a novel hardware implementation of a modulo ADC within the Unlimited Sensing Framework, significantly enhancing dynamic range and resolution for HDR signals with practical hardware benefits.

Contribution

A low-cost, integrator-based modulo ADC hardware design that imposes no restrictions on folding rates, enabling superior HDR capture in USF systems.

Findings

Captured HDR signals with 60-fold increased dynamic range

Achieved up to 5 ENOBs in experiments

Improved SINAD by 30 dB

Abstract

Conventional digitization based on the Shannon-Nyquist method, implemented via analog-to-digital converters (ADCs), faces fundamental limitations. High-dynamic-range (HDR) signals often get clipped or saturated in practice. Given a fixed bit budget, one must choose between minimizing quantization noise or accommodating HDR inputs. The Unlimited Sensing Framework (USF) eliminates saturation by incorporating nonlinear folding in analog hardware, resulting in modulo signals. Quantizing or digitizing modulo signals enables low quantization noise as the modulo representation maps HDR signals into low-dynamic-range (LDR) samples. In the context of USF, the core innovation of this paper is a novel, low-cost, integrator-based efficient modulo ADC hardware implementation that imposes no restrictions on folding rates, enabling significantly HDR capture. The feasibility of this design is demonstrated by hardware experiments showcasing clear advantages across different quantitative performance metrics. These include capturing HDR signals with a 60-fold increase in dynamic range, achieving up to 5 Effective Number of Bits (ENOBs), and improving Signal-to-Noise and Distortion (SINAD) by 30 dB.