Σ-Δ调制器的非理想特性建模与验证  

Non-Idealities Modeling and Verification of Σ-Δ Modulator

作　　者：陈凯[1] 张文俊[1] 余志平[1] 

机构地区：[1]清华大学微电子所CAD研究室,北京100084

出　　处：《微电子学与计算机》2010年第5期5-8,13,共5页Microelectronics & Computer

基　　金：国家"九七三"计划项目(2006CB302705)

摘　　要：Σ-Δ调制器是常用于混合信号电路中的一个关键模块.基于一个的二阶低通调制器,对包括非理想开关、色噪声模型、非线性运放直流增益和多比特量化器中的电容适配在内的非理想效应,进行了分析和建模.该调制器在HJTC0.18μm工艺下实现并进行了流片测试.通过对行为级仿真和实际测试数据的对比,验证了提出的高层次建模方法,可以准确高效地指导调制器系统级和电路级设计.Σ-Δ modulator is a common used critical part in mixed signal circuits. In this paper, based on a second order low-pass modulator, all the non-idealities are analyzed and modeled including non-ideal switch, colored noise model, non-linear DC gain and multi-bit DAC capacitor mismatch, which are not included together in existing work. The modulator is implemented in HJTC 0.18μm process with taping out and test has been accomplished. Modulator model is verified through compare with circuit simulation and actual circuit measurement data. The presented modeling method serves as an accurate and efficient guide for architecture and modulator circuit design.

关 键 词：Σ-Δ 调制器 运放非理想特性 电容失配 高层次建模 

分 类 号：TN792[电子电信—电路与系统]