现代电子技术2011，Vol.34Issue(18)：165-169,5.
一种模/数混合型FIR噪声滤波器设计
Design of Analog and Digital Mixed FIR Noise Filter
摘要
Abstract
In combination with the method of analog circuit, a hybrid FIR noise filtering technology is proposed to solve the problem of noise amplification existing in the existing digital FIR noise filtering technology. This method converts the dig-ital control phase error in phase-locked loop to simulation domain charge by the aid of a charge pump. One or several clock cy-cle delay of the modulator output is realized through a registers chain. Some taps are choosen to control the corresponding fre-quency dividers or phase selectors respectively to quantify the generated instantaneous phase error through phase discrimina-tors in every branch and synthetize the analog domain error charge in a multi-input charge pump. The noise amplification prob-lem of the existing digital FIR filtering technology is solved by providing a constant DC gain. The novel filter has the following characteristics: the work of time domain can be dispersed; the analog mismatch isn't sensitive) it is helpful for linearity im-provement, so the cost of additional hardware is lower.关键词
FIR滤波/△-∑调制/锁相环/量化噪声Key words
FIR filtering/ Δ-Σ modulation/ phase-locked loop/ quantization noise分类
信息技术与安全科学引用本文复制引用
易鸿..一种模/数混合型FIR噪声滤波器设计[J].现代电子技术,2011,34(18):165-169,5.基金项目
四川文理学院基金资助项目(2010B01Z) （2010B01Z）
