一种带宽分辨率可配置的Delta-Sigma调制器OA

This paper presents a bandwidth and resolution-configurable discrete-time Delta-Sigma modulator based on switched-capacitor circuits.To address the diverse requirements for measurement precision,signal bandwidth,and dynamic range in various industrial ap-plications,the modulator features a reconfigurable loop filter architecture that can switch between third-order and fourth-order modes via an external control signal.Concurrently,the system enables the collaborative adjustment of signal bandwidth and resolution by adapting different oversampling ratios(OSRs).System modeling and simulations were conducted using MATLAB(OSR=200).Regarding stability,the third-order mode demonstrates substantially relaxed conditions,yielding a Maximum Stable Amplitude(MSA)of-4.4 dBFS.This represents an optimization of 15.2 dB relative to the fourth-order mode(-19.6 dBFS),rendering it appropriate for large-amplitude signal processing.In terms of resolution,the fourth-order mode demonstrates superior noise-shaping capabilities,achieving a dynamic range(DR)of-154.4 dBFS,a 24.8 dB improvement over the third-order mode(-129.6 dBFS),enabling the precise resolu-tion of weak signals.To verify the configurability of bandwidth and precision,performance metrics were tested under varying OSRs.Simulation data indicate that in the low-OSR region(OSR<20),the third-order modulator provides a superior Signal-to-Quantization-Noise Ratio(SQNR).