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Connector Technology & Design
Forum AD转换器的主要技术指标
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Related

AD转换器的主要技术指标

YYD
YYD over 14 years ago

1)分辩率(Resolution)指数字量变化一个最小量时模拟信号的变化量,定义为满刻度与2的n次方的比值。分辩率又称精度,通常以数字信号的位数来表示。

  2)转换速率(ConversionRate)是指完成一次从模拟转换到数字的AD转换所需的时间的倒数。积分型AD的转换时间是毫秒级属低速AD,逐次比较型AD是微秒级属中速AD,全并行/串并行型AD可达到纳秒级。采样时间则是另外一个概念,是指两次转换的间隔。为了保证转换的正确完成,采样速率(SampleRate)必须小于或等于转换速率。因此有人习惯上将转换速率在数值上等同于采样速率也是可以接受的。常用单位是ksps和Msps,表示每秒采样千/百万次(kilo/MillionSamplesperSecond)。

  3)量化误差(QuantizingError)由于AD的有限分辩率而引起的误差,即有限分辩率AD的阶梯状转移特性曲线与无限分辩率AD(理想AD)的转移特性曲线(直线)之间的最大偏差。通常是1个或半个最小数字量的模拟变化量,表示为1LSB、1/2LSB。

  4)偏移误差(OffsetError)输入信号为零时输出信号不为零的值,可外接电位器调至最小。

  5)满刻度误差(FullScaleError)满度输出时对应的输入信号与理想输入信号值之差。

  6)线性度(Linearity)实际转换器的转移函数与理想直线的最大偏移,不包括以上三种误差。

  其他指标还有:绝对精度(AbsoluteAccuracy),相对精度(RelativeAccuracy),微分非线性,单调性和无错码,总谐波失真(TotalHarmonicDistotortion缩写THD)和积分非线性。

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