On the Design and Analysis of the 4 th -Order Leapfrog Sigma-Delta Modulator
In this paper, a novel methodology for designing and analyzing high performance sigma-delta leapfrog modulators for ultra-high resolution analog-to-digital (A/D) converters is presented. The less sensitive topology, the leapfrog topology, in component variations is analyzed by considering the noise transfer function (NTF). By using theoretical analysis, the loop coefficients are constrained to a small, clear and definite range called the stable region. With the output voltage limited within ±2V, an absolutely stable region (ASR) is obtained. A program that analyzes and generates the required coefficients is constructed for easily designing this topology. For a 256 over-sampling ratio (OSR) and the coefficients from ASR, the signal to noise ratio (SNR) and dynamic range (DR) are 105 dB and 100 dB, respectively. In accordance with the behavior simulation results, the system is not only stable and efficient but also suitable for high-resolution applications.
Kuei-Chih Lin Chuan-Hsi Liu
Department of Electronic Engineering Ming Chuan University 5 The-Ming Road, Gwei-Shan District, Taoy Department of Electronic Engineering Ming Chuan University 5 The-Ming Road, Gwei-Shan District, Taoy
国际会议
2006 International Conference on Communications,Circuits and Systems(第四届国际通信、电路与系统学术会议)
广西桂林
英文
2304-2308
2006-06-25（万方平台首次上网日期，不代表论文的发表时间）