- 专利标题: Method and apparatus for mismatched shaping of an oversampled converter
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申请号: US09949807申请日: 2001-09-12
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公开(公告)号: US06628218B2公开(公告)日: 2003-09-30
- 发明人: Todd L. Brooks , David S. P. Ho , Kevin L. Miller , Eric Fogleman
- 申请人: Todd L. Brooks , David S. P. Ho , Kevin L. Miller , Eric Fogleman
- 主分类号: H03M300
- IPC分类号: H03M300
摘要:
Methods and apparatuses for spectrally shaping mismatch errors in a multi-bit digital to analog converter (DAC). In an embodiment, the multi-bit DAC is constructed from K separate multi-element sub-DACs, where K and the number of elements in each sub-DAC are each preferably greater than two. A received digital input code is split into a set of K sub-codes corresponding to the digital input code. The set of K sub-codes can have one of at least N different sub-code orders that specify an order of each of the K sub-codes with respect to one another, where N>2. A sum of the K sub-codes equals the digital input code. One of the at least N different sub-code orders is selected using a shuffling algorithm. Then, each sub-code in the set of K sub-codes is output in accordance with the selected sub-code order.
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