Multibit Delta-Sigma Architectures with Two-Level Feedback Loop Using a Dual-Quantization Architecture

摘要

This paper proposes two novel Multi-bit Delta- Sigma Modulator (ΔΣM) architectures based on a Dual- Quantization architecture. Byusing multi-bit quantization with single-bit feedback, both eliminatethe need for a multi-bit digital-to-analog converter (DAC) in thefeedback loop. The first is a Digital quantization-Error CancelingMulti-bit (DECM)- ΔΣ M architecture that is able to achieve highresolution at a low oversampling ratio (OSR) because, by adjustingthe coefficients of both analog and digital circuits, it is able tocancel completely the quantization error injected into the single-bitquantizer.