发明名称 |
METHOD AND APPARATUS FOR SUPPRESSING TONES INDUCED BY CYCLIC DYNAMIC ELEMENT MATCHING (DEM) ALGORITHMS |
摘要 |
<p>Disclosed is a method and apparatus for performing Dynamic Element Matching (DEM). The method operates to input a plurality of digital values and, for each value, to generate a plurality of N signals individual ones of which are intended to drive one of a plurality of N elements. The plurality of signals are generated so as to average the usage of individual ones of the N elements over time. The method further periodically rearranges the plurality of N signals so as to suppress the generation of undesired periodicities or tones in the usage of the N elements, and without affecting the averaging of the usage of the N elements. Preferably the periodic rearrangement occurs only at a time when the usage of the N elements is indicated as being averaged using, for example, an enable signal that is input to a secondary DEM block from a primary DEM block. The plurality of N signals are preferably generated by the primary DEM block using a cyclic DEM algorithm, such as a Data Weighted Averaging (DWA) algorithm or a rotation-based Clocked Averaging (CLA) algorithm, and the periodic rearrangement performed by the secondary DEM block is preferably based on randomization or pseudo-randomization.</p> |
申请公布号 |
EP1402644(B1) |
申请公布日期 |
2007.08.01 |
申请号 |
EP20020735842 |
申请日期 |
2002.06.13 |
申请人 |
NOKIA CORPORATION |
发明人 |
RUHA, ANTTI;RUOTSALAINEN, TARMO;TERVALUOTO, JUSSI, PEKKA;KAUPPINEN, JANI |
分类号 |
H03M1/06;H03M1/74;H03M3/00 |
主分类号 |
H03M1/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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