A Direct Calibration Algorithm for ADC Interleaving

TL;DR

This paper presents a new direct calibration algorithm for ADC interleaving systems that uses sinusoidal signals and Fourier analysis to correct phase, gain, and offset mismatches, improving signal accuracy.

Contribution

The paper introduces a novel, computationally efficient calibration method for ADC interleaving that outperforms existing techniques in accuracy and robustness.

Findings

Significantly improves signal reconstruction accuracy

Effective correction of phase, gain, and offset mismatches

Validated through extensive numerical simulations

Abstract

We introduce a novel direct calibration algorithm to address phase delay, gain, and offset mismatches in Analog-to-Digital Converter (ADC) time interleaving systems. These mismatches, common in high-speed data acquisition, degrade system performance and signal integrity, particularly in applications such as radio astronomy and very long baseline interferometry (VLBI). Our proposed algorithm uses a sinusoidal reference signal and Fourier analysis to isolate and correct each type of mismatch, providing a computationally efficient solution. Extensive numerical simulations validate the algorithm's effectiveness and demonstrate its ability to significantly enhance signal reconstruction accuracy compared to existing methods. This work provides a robust and scalable solution for maintaining signal fidelity in interleaved ADC systems and has broad applications in fields that require high-speed data acquisition.