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A SAR-Assisted Continuous-Time M-0 MASH Delta-Sigma Modulator With Digital-Domain Noise Leakage Shaping
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DOI：10.1109/OJCAS.2026.3663446.png)
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Abstract
En 中文
Delta-sigma ( Delta Sigma ) modulators are widely used in high-resolution analog-to-digital converters (ADCs). With continued technology scaling, digital-intensive Delta Sigma architectures are increasingly favored over traditional analog-centric designs. This work presents a successive approximation register (SAR)-assisted digital noise-coupling (DNC)-based noise-leakage shaping technique for continuous-time (CT) M -0 multi-stage noise-shaping (MASH) Delta Sigma modulators, complemented by a digital back-end integrator. The key building blocks for implementing DNC-based noise-leakage shaping, including the interface between the first and second stages, are efficiently realized through a SAR-assisted structure, while the DNC filter is implemented using simple digital delay cells, enabling a compact and hardware-efficient design. Extensive behavioral simulations demonstrate robustness against key nonidealities, including finite opamp gain, limited unity-gain bandwidth (UGBW), and wide coefficient variations, and circuit-level results validate the practicality and effectiveness of the proposed architecture for high-resolution, low-power applications.
Keywords:
Multi-stage noise shaping
Noise
Registers
Modulation
Quantization (signal)
Digital filters
Hardware
Delays
Couplings
Complexity theory
Analog-to-digital converter
delta-sigma modulator
ADC
DSM
SAR ADC
SAR-assisted DSM
MASH
noise coupling
digital noise coupling
noise leakage shaping
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2.4
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4.5K
Citations:
387
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Cited Papers