摘要
提出了一种电阻链置换式分级并行转换的新原理,由此产生了置换式DAC和ADC:(1)置换式DAC,通过m级×n位电阻链的置换,直接将数字信号转换成模拟电压信号,而不要转换成权电流的中间环节,其电流仅需当前DAC的电流的1/2m×n;(2)置换式ADC,以组成m级×n位ADC为例,仅需一套n位的全并行式ADC,直接将模拟电压信号转换成数字信号;(3)可以构造出对数置换式ADC和DAC,远优于当前采用的A压缩律和μ压缩律的ADC。在语音通信中构造出8位对数压缩律的ADC,在信号动态范围为100 dB的条件下,对数置换式ADC的信噪比高达31.2 dB。
A new principle of replacement type converted by grade parallel of resistance chain is presented, thus producing the replacement type DAC and ADC： （1） The replacement type DAC, by the replacement of m grades ×n bits resistance chain, converts digital signal into analog voltage signal. It doesnot need middle steps of converting into the weight electric current, and its electric current is just 1/2^m×n of existing DAC. （2） The replacement type ADC, formed by m grades ×n bits ADC, it needs just one set of n bit full parallel type ADC and converts the analog voltage signal into the digital signal. （3） It can form a logarithm replacement type ADC or DAC, and is superior than ADC. The ADC adopts A compression ratio and μ compression ratio. In sound communication, it forms the ADC of 8 bit logarithm compression ratio, under the condition of dynamic signal range of 100 dB, the signal to noise ratio of the logarithm replacement type ADC reaches 31.2 dB.
出处
《数据采集与处理》
CSCD
北大核心
2007年第1期115-120,共6页
Journal of Data Acquisition and Processing
关键词
数字-模拟转换设备
模拟-数字转换设备
压缩律
电阻链
digital-analog convert （DAC） equipment
analog-digital convert （ADC） equipment compression ratio
resistance chain
作者简介
陈启星（1956-），男，副教授，研究方向：模拟信号数字化、数据结构，E—mail：hongye1122@126．com；
罗启宇（1954-），男，高级工程师，研究方向：模拟信号数字化、数据结构；
陈叶（1987-），女，本科生。
