Assessment of Analog Time Multiplexing in SDM Digital to Analog Converters

TL;DR

This paper evaluates an analog time multiplexing approach in SDM DACs through simulations, identifies gain mismatch as a key issue, and proposes a dynamic matching technique to improve robustness.

Contribution

It introduces a novel dynamic elements matching method to mitigate gain mismatch in analog multiplexed SDM DACs.

Findings

Gain mismatch significantly affects performance.

Dynamic matching improves robustness.

Simulation results validate the proposed technique.

Abstract

Analog multiplexing for sigma delta modulated Digital to Analog Converters has been recently proposed as a means of achieving robustness. This preprint analyses said scheme via simulations. The main limitation introduced by the proposed architecture comes from mismatch in the DACs gain, which can drastically impact performances. A new technique of dynamic elements matching is proposed here to overcome this problem.