三阶一位量化CIFB结构∑-ΔADC调制器设计  

Three order a quantitative CIFB Sigma-Delta ADC modulator

作　　者：李新[1] 王龙[1] 李俊[1] 黄璜[1] 

机构地区：[1]沈阳工业大学信息科学与工程学院,辽宁沈阳110870

出　　处：《电子设计工程》2014年第3期156-160,共5页Electronic Design Engineering

摘　　要：提出了一种基于Maltab SIMULINK的Sigma-Delta调制器的设计与仿真方法,采用单环三阶CIFB结构、一位量化器位数和256倍过采样率,设计中对噪声传输函数的零极点和系统反馈系数进行了优化,缩小了模拟电路的设计难度,提升了系统稳定性。在考虑积分器的有限直流增益、饱和电压、压摆率和增益带宽等非理想因素情况下进行建模,得到了SNDR和ENOB分别为123 dB,20.14 bits,仿真结果表明,该结构可在低量化位数的情况下,得到较高的精度和较好的稳定性,可在高层次上指导调制器晶体管级电路设计。Based on Maltab SIMULINK,the design and simulation method of Sigma-Delta modulator with single ring third-order CIFB structure,a quantizer bits and 256 times oversampling rate are investigated.The zero and pole of the noise transfer function and feedback coefficient are optimized to reduce the design difficulty of analog circuit and enhance the system stability.Finite Gain,Saturation Voltages,Slew-Rate,Gain-Bandwidth are analyzed,and the SNDR and ENOB are 123dB and 20.14bits.The simulation results show,in the case of low quantitative figures the structure can get higher precision and better stability.The design parameters can guide the modulator transistor level circuit design at a high level.

关 键 词：SIGMA-DELTA调制器 一阶量化 CIFB 噪声整形 

分 类 号：TN433[电子电信—微电子学与固体电子学]