发明授权
- 专利标题： Method and apparatus for randomized dynamic element matching DAC
- 专利标题（中）： 随机动态元件匹配DAC的方法和装置
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申请号： US09427195申请日： 1999-10-25
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公开(公告)号： US06466147B1公开(公告)日： 2002-10-15
- 发明人: Henrik T. Jensen , Joseph F. Jensen
- 申请人： Henrik T. Jensen , Joseph F. Jensen
- 主分类号： H03M166
- IPC分类号： H03M166
摘要：
A method and apparatus for digital-to-analog conversion utilizing randomized dynamic element matching for the attenuation of harmonic distortion during the conversion process due to non-ideal circuit behavior is presented. The present invention introduces a new DEM approach that results in a simplified DAC architecture relative to previous DACs, while preserving optimal spurious-free dynamic range (SFDR). The particular topology utilized involves the use of a bank of DAC-elements, preferably 1-bit DAC elements, the outputs of which are summed to yield a single multiple-level DAC. During each conversion cycle, random selection is used to determine the addresses of the DAC-elements used in order to “scramble” the DAC noise arising from each individual 1-bit DAC.