请分别说明 A/D 与 D/A 转换器的作用，说明它们的主要技术指标，并进一步说明在什么情况下必须在 A/D 转换器前加采样·保持电路。 -题库考试答案搜索网

请分别说明 A/D 与 D/A 转换器的作用，说明它们的主要技术指标，并进一步说明在什么情况下必须在 A/D 转换器前加采样·保持电路。

问答题

2022-04-02 13:05

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正确答案

A/D与D/A转换器分别能够将模拟量转换成数字量与数字量转换成模拟量，通过这样的转换电路，能够将模拟系统和数字系统联系起来，实现对模拟系统的检测、监视和控制。A/D与D/A转换器的主要技术指标分别为转换进度和转换时间。因为A/D转换需要一定的时间，当在这段时间里，被转换的信号发生改变，将使转换结果不准确，必须将要转换时刻的模拟量保持下来，确保转换期间该值的稳定。

试题解析

标签：东北林业大学计算机科学与技术专升本数字逻辑期末考试

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