Quadrature Control-Bounded ADCs

TL;DR

This paper extends control-bounded ADCs to band-pass applications, enabling flexible center frequency placement while maintaining stability, bandwidth, and SNR, validated through behavioral and Monte Carlo simulations.

Contribution

It introduces a band-pass control-bounded ADC design that preserves key performance metrics and demonstrates robustness, expanding the applicability of control-bounded ADCs.

Findings

Successful translation of low-pass to band-pass ADCs with preserved stability and SNR

Validated performance across various filter orders and oversampling ratios

Demonstrated robustness against component variations through Monte Carlo simulations

Abstract

In this paper, the design flexibility of the control-bounded analog-to-digital converter principle is demonstrated by considering band-pass analog-to-digital conversion. We show how a low-pass control-bounded analog-to-digital converter can be translated into a band-pass version where the guaranteed stability, converter bandwidth, and signal-to-noise ratio are preserved while the center frequency for conversion can be positioned freely. The proposed converter is validated with behavioral simulations for a variety of filter orders, notch-filter frequencies, and oversampling ratios. Finally, robustness against component variations is demonstrated by Monte Carlo simulations.