一种新的连续时间Sigma-delta调制器系统设计方法  

A Novel Continuous-time Sigma-delta Modulator System Design Methodology

作　　者：华斯亮[1,2] 张建恩[1,2] 王东辉 张铁军[1,2] 

机构地区：[1]中国科学院声学研究所数字系统集成实验室,北京100190 [2]中国科学院研究院,北京100049

出　　处：《微计算机应用》2010年第3期54-57,共4页Microcomputer Applications

摘　　要：连续时间结构sigma-delta调制器中包括两种频域,是该结构设计的难点之一。本文在分析传统的连续时间调制器的设计流程后,提出一种新的设计方法。该方法增加了CT-DT变换,把连续时间环路滤波器转换到离散时间状态空间,利用离散时间调制器的成熟的设计平台进行设计,可以减少设计反复,加速设计收敛。利用该方法,本文设计了一个可用于手机电视的高速度、中高精度的连续时间sigma-delta调制器。Continuous-time sigma-delta modulator contains two frequency domains, which is one of the key points in system design This paper presents a new systen design methodology after analyzing classic continuous-time sigma-delta modulator system design flow. The CT-DT conversion is added to the method,which converts continuous-time loop filter to discrete-time state space. In discrete-time state space, the modulator can be designed on the mature discrete-time design platform. The methodology can reduce the iteration and speed the design process. With the methodology, a continuous-time sigma delta modulator for mobile TV is designed as an example.

关 键 词：连续时间 sigma—delta 调制器 模数转换器 

分 类 号：TN761[电子电信—电路与系统]