Modeling of a 24-bit High-resolution Sigma-Delta ADC
LI Zhongda
ZENG Huiming
ZHAO Haoyang
ZHOU Dong
Abstract：A 24-bit high-resolution Sigma-Delta ADC system structure is presented in the paper,which is designed by adopting oversampling technology and noise shaping technology and simulated in Simulink.A modulator structure with OSR=128,6th order,single loop,feedforward and one bit quantization is realized.The modulator coefficients are obtained by Matlab.In the Simulink ideal model,the signal-to-noise ratio(SNR)can reach 148.5 dB.Considering the non-ideal factors such as KT/C noise,clock jitter and operational amplifier noise,the SNR is 126 dB.The 24-bit high-resolution Sigma-Delta ADC can satisfy a variety of industrial measurement scenarios(such as temperature measurement,pressure measurement,industrial automation monitoring,etc.)and medical applications(ECG measurement,EEG measurement,telemedicine,etc).
Keywords：high-resolutionSigma-Delta ADCmodulatoroversamplingnoise shaping
Publication Date：2025-07-20
Online Publishing Date：2025-09-25(First online date of this platform, not the publication date of the document)
Pages：5( 1852-1856 )