1785-ACC5LB
作者:2016/8/4 7:57:58

1785-ACC5LB

1785-ACC5LB

1785-ACC5LB

并行比较ADC主要特点是速度快,它是所有的A/D转换器中速度***快的,现***展的高速ADC大多采用这种结构,采样速率能达到1GSPS以上。但受到功率和体积的限制,并行比较ADC的分辨率难以做的很高。

这种结构的ADC所有位的转换同时完成,其转换时间主取决于比较器的开关速度、编码器的传输时间延迟等。增加输出代码对转换时间的影响较小,但随着分辨率的提高,需要高密度的模拟设计以实现转换所必需的数量很大的精密分压电阻和比较器电路。输出数字增加一位,精密电阻数量就要增加一倍,比较器也近似增加一倍。

并行比较ADC的分辨率受管芯尺寸、输入电容、功率等限制。结果重复的并联比较器如果精度不匹配,还会造成静态误差,如会使输入失调电压增大。同时,这一类型的ADC由于比较器的亚稳压、编码气泡,还会产生离散的、不***的输出,即所谓的“火花码”。

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