A 2nd-Order Noise Shaping SAR ADC Realizing NTF Zero-Pole Optimization Based on IIR-FIR Filter  

作　　者：ZHANG Yanbo LIU Shubin LIANG Yuhua ZHU Zhangming 

机构地区：[1]School of Microelectronics,Xidian University,Xi’an 710071,China

出　　处：《Chinese Journal of Electronics》2022年第1期33-39,共7页电子学报（英文版）

基　　金：supported by the National Key Research and Development Project of China(2018YFB2202400);the National Natural Science Foundation of China(U19A2053,61625403,61874174,62074119,62021004).

摘　　要：This paper reports a successive approx-imation register(SAR)analog-to-digital converters(ADCs)with the 2nd-order and optimized noise shaping(NS)scheme.Based on the feed-forward structure,both noise transfer function(NTF)zero and pole optimization have been achieved simultaneously utilizing a cascaded IIR-FIR(infinite impulse response and finite impulse re-sponse)filter.The analysis shows that the proposed struc-ture provides a better NS efficiency than prior arts.The efficiency of the proposed NS scheme and the ADC per-formance are verified by simulation achieving a 14.2 ef-fective number of bits with an 8-bit SAR ADC architec-ture at an over sampling rate of 8 sampled at 100 MS/s.Taking advantage of the NTF zero-pole optimization,a low resolution SAR ADC is allowed under the same quantization noise budget in this structure.

关 键 词：Analog-to-digital converters(ADCs) FEED-FORWARD Zero-pole optimization Noise shaping Oversampling ADC Successive approximation register 

分 类 号：TN713[电子电信—电路与系统] TN792