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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 novel principle of shunt-parallel conversion of resistor chain is proposed, which results in a permutative DAC and ADC: (1) Displacement DAC converts the digital signal directly into analog Voltage signal, but not converted into the right of the intermediate part of the current, the current only the current DAC current 1 / 2m × n; (2) displacement ADC to form m × n bit ADC, for example, only one n bits of parallel ADC, the analog voltage signal directly into digital signals; (3) can be constructed logarithmic displacement ADC and DAC, far superior to the current A compression law and μ compression law ADC. In voice communication, an 8-bit logarithmic compressed ADC was constructed. The signal-to-noise ratio of the logarithmic permutation ADC was as high as 31.2 dB under the dynamic range of 100 dB.