×

用一个A D转换器提取和数字化交流信号

消耗积分:3 | 格式:rar | 大小:60 | 2009-06-12

分享资料个

Unwanted portions of a signal, such as a DC pedestal, can be
difficult to reject in a single supply circuit. A DC pedestal
voltage most typically appears at the output of an operational
amplifier with a small signal riding on top of it. This
pedestal voltage is required in the analog domain to insure
that the small signal that contains the pertinent information
never falls below the ground potential, where clipping will
occur. In order to digitize this type of signal, the DC offset
forces the designer to use extremely high resolution (20 plus
bits), wide dynamic range A/D converters to capture the
small signal that is of interest to a reasonable resolution such
as 12 bits. The DS converters, ADS1210, ADS1211,
ADS1212, or ADS1213, are appropriate for this function.
An alternative to using a high resolution converter would be
to add an analog stage where the signal is level shifted to
eliminate the DC offset. Unfortunately, this may complicate
matters further in creating a situation where dual supplies
are required.

声明:本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人,不代表电子发烧友网立场。文章及其配图仅供工程师学习之用,如有内容侵权或者其他违规问题,请联系本站处理。 举报投诉

评论(0)
发评论

下载排行榜

全部0条评论

快来发表一下你的评论吧 !