基于K渐变传输线的TIADC低失配宽带前端功率分配器设计  

Low-Mismatch High-Speed Power Divider Design for TIADC Front End Based on Klopfenstein Impedance Taper

作　　者：霍然[1] 邹月娴[1] 

机构地区：[1]北京大学深圳研究生院信息工程学院,深圳518055

出　　处：《数据采集与处理》2011年第6期702-708,共7页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(60775003)资助项目;深圳市科技计划资助项目

摘　　要：并行交替模拟数字转换器(Time-interleaved analog-to-digital convertor,TIADC)是实现高速高精度模拟数字转换的有效方法。TIADC中各通道电气特性的不一致引入了通道间失配,这大大降低了TIADC系统的性能。宽带低失配TIADC前端模块的设计和实现是降低TIADC系统通道失配的关键。本文针对超高速高精度TIADC系统,提出了基于K渐变传输线的宽带低失配功率分配器架构,并针对8通道12 bit 4 Gsps的TIADC系统进行设计、仿真和实现研究。研究结果表明,本设计具有通道易扩展、宽带和低失配的优良特性,为高速高精度TIADC系统的低失配宽带前端功率分配器设计提供了可行方案。Time-interleaved analog-to-digital convertor （TIADC） is one of the most promising methods to achieve the high-speed and high-resolution for analog-to-digital conversion. Unfortunately, the imperfection of the characteristics of the circuits in each ADC branch leads to the bandwidth mismatch, gain mismatch, offset mismatch and sampling time mismatch, which severely degrade the performance of the TIADC system. The analog front-end of the TIADC system is the main source causing the mismatches. As the result, the implementation of low- mismatch and high-speed power divider becomes one of the key technologies to improve the performance of the TIADC systems as well as to reduce the digital back-end design complexity. This paper proposes a new approach to design a low-mismatch and wideband power divider using Klopfenstein impedance taper for multichannel high-speed and high-resolution TIADC sys- tems. We study the design of the 1 ＂ 8 power divider for an 8-channel 12 bit 4 Gsps TIADC system. Simulations are carried out to evaluate the performance of the designed 1 ~ 8 power di- vider. Research results show that the designed power divider is with some favorable character- istics, such as channel-expandable, low-mismatch and broadband, which provide one promising solution for the design of the low-mismatch high-speed power divider of TIADC systems.

关 键 词：K渐变 并行交替模拟数学转换器 前端模块 功率分配器 

分 类 号：TN811[电子电信—信息与通信工程]