电子科技2025，Vol.38Issue(7)：50-57,8.DOI:10.16180/j.cnki.issn1007-7820.2025.07.007
基于车载语音芯片开关电容积分电路设计
Design of Switched-Capacitor Circuits Based on on-Board Voice Chip
摘要
Abstract
In order to cope with the problem of high power consumption of Sigma-Delta AD(Sigma-Delta Ana-log-to-Digital Converter),a switched capacitor integrator suitable for low-power and high-precision speech recogni-tion chip is proposed.A new modeling idea is proposed in the MATLAB system modeling,and the non-ideal factor coefficients are redefined according to the parasitic parameters of the MOS(Metal-Oxide-Semiconductor)tube,so that the model is closer to the actual circuit.The Sigma-Delta modulator model uses a 3-order single-bit feedforward modulator with an oversampling rate of 128 times.By simulating the Sigma Delta modulator model,the integrator co-efficients of all levels can be obtained,which provides guidance for the design of MOS transistor circuit with Cadence software.In the MATLAB system modeling simulation,the simulation results show that the effective bit number of Sigma-Delta modulator can reach 16.95 bits,and the signal-to-noise ratio can reach 103.8 dB.In the process of 0.18 μm,the first-stage integrator circuit of the Sigma-Delta modulator is designed,and the operational amplifier in the first-stage switched-capacitor integrator is simulated and verified.Simulation results show that the DC gain can reach 104 dB,the gain bandwidth product is 72 MHz,the phase margin is 85°,and the DC quiescent power con-sumption is 915 μW.关键词
MATLAB/Simulink/Sigma-Delta调制器/开关电容/折叠共源共栅运放/增益增强/低功耗Key words
MATLAB/Simulink/Sigma-delta modulator/switched-capacitor/folded cascode/gain boost/low power consumption分类
信息技术与安全科学引用本文复制引用
余鑫,张轩雄,李文宏..基于车载语音芯片开关电容积分电路设计[J].电子科技,2025,38(7):50-57,8.基金项目
国家自然科学基金(62276167)National Natural Science Foundation of China(62276167) （62276167）
