Study of Q Factor and Loop Delay Effects of a Continuous-Time △ ΣAD Modulator

摘要：

This paper describes the design and analysis of a continuous-time bandpass △ Σ AD modulator for RF sampling.We determined the SNDR degradation due to finite Q value of the loop resonator,and due to excess loop delay (ELD).SNDR was improved by 20dB by adding a digital filter which compensates for the effect of finite Q value,and SNDR was further improved by 20dB by feedforward with parameters optimized to compensate for ELD. We have confirmed the effectiveness of the digital filter and feedforward proposals using Matlab and SPICE simulations.

关键词： RF sampling Continuous-time △ Σ AD Modulator Q value ELD Sub-sampling

作者: Haijun Lin Atushi Motozawa Pascal Lo Ré Kunihiko lizuka Haruo Kobayashi Hao San

作者单位: Gunma University of Japan Sharp Corporation of Japan Tokyo City University of Japan

会议类型: 国际会议

会议名称: 2009 IEEE 8th International Conference on ASIC(第八届IEEE国际专用集成电路大会)

会议地点: 长沙

会议语种:英文

页码: 230-233

在线出版日期: 2009-10-20（万方平台首次上网日期，不代表论文的发表时间）