一种应用于流水折叠式A/D转换器的失调抵消预放大器  

Offset cancellation preamplifier for pipelined folding A/D converter

作　　者：李晓娟[1] 杨银堂[1] 

机构地区：[1]西安电子科技大学微电子学院,陕西西安710071

出　　处：《西安电子科技大学学报》2012年第2期95-100,174,共7页Journal of Xidian University

基　　金：国家自然科学基金资助项目(60725415;60971066;61006028);国家863资助项目(2009AA01Z258);陕西省重大技术创新专项资助项目(2009ZKC02-11)

摘　　要：根据流水折叠式A/D转换器的应用要求,设计了一种失调抵消预放大器.采用开关电容电路实现失调存储技术,以减小输入失调电压对转换精度的影响,并通过引入MOS电容实现回馈噪声中和技术.基于SMIC 0.18μm CMOS工艺,在1.8V电源电压、200MHz时钟频率下,对所设计的预放大器进行了功能验证和蒙特卡洛分析.其失调方差仅为3.24mV,功耗为362μW.测试了整个10位100MS/s A/D转换器,最大INL和DNL分别为1.6LSB和0.6LSB.在fin=32MHz,fs=100MHz时,测得SFDR为55dB.This paper presents an offset cancellation preamplifier based on the requirement of the pipelined folding A/D converter.The offset storage technique is realized with switched capacitor circuits to eliminate the effect of the input offset voltage on the resolution.The neutralization technique is introduced by MOS capacitors to reduce the kickback noise.In the SMIC 0.18 μm CMOS process,by Mente Carlo simulation the preamplifier with offset variance of 3.24 mV is verified and 362 μW is consumed at 1.8 V and 200 MHz.The measured peak INL and DNL are 1.6 LSB and 0.6 LSB for the 10 bit 100 MS/s A/D converter.SFDR is 55 dB when fin= 32 MHz at fs= 100 MHz.

关 键 词：失调抵消 回馈噪声 预放大器 A/D转换器 流水折叠 

分 类 号：TN402[电子电信—微电子学与固体电子学]