高精度两次采样AD转换

AD 转换是测量中一个非常重要的部分，为了达到精度比较高的转换效果，人们往往选择位数较高的AD 转换器，这样容易造成电路的成本过高。本文就介绍一种如何利
用普通的AD 转换器来实现高精度的AD 转换，它利用两次采样的原理，通过一个模拟量进行两次转换，从而实现高精度。此转换器所需元件比较简单，主要由一个凌阳SPCE061A单片机和一些普通的选通、运放电路组成，文章从硬件电路的组成和软件程序的编写两个方面来进行说明，清晰的介绍了如何来实现高精度转换的功能。
【关键词】 AD 转换，高精度，两次采样，原理
【ABSTRACT】In the scopes of measure, AD conversion is a very important part, the higher bit AD converter always is chosen in order to gain high precision, but it is very expensive for the circuit . With twice sampling theory, an analog voltage is converted twice to realize the high precision. The converter is composed of lingyang SPCE061A mcu, ordinary gates and amplifiers, it is simple. That how to realize the high precision conversion is showed clearly on hardware circuit and software programs in this article.
【KEYWORDS】 AD conversion, high precision, twice sample, elements