发明名称 |
HIGH RESOLUTION INTERLEAVED DELAY CHAIN |
摘要 |
An improved delay chain for use in a delay locked loop which provides smooth phase adjustment and high resolution. In a delay chain having a series of cascaded unit delay elements, the outputs of a pair of contiguous delay elements (N, N+1) are selected for input to a phase blender. A coarse delay adjustment is carried out by selecting the outputs of the next pair of contiguous delay elements (N+1, N+2) and thus affects only one of the phase blender inputs. The phase blender provides a fine delay adjustment by generating an output whose phase is a weighted combination of the inputs, the weights having an inverse relationship. A coarse delay adjustment which affects an input of the phase blender is carried out when the weighting of that input is zero. Fine-to-coarse hand-over problems which characterize known delay locked loops are thus avoided.
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申请公布号 |
US2004130365(A1) |
申请公布日期 |
2004.07.08 |
申请号 |
US20030337606 |
申请日期 |
2003.01.07 |
申请人 |
INFINEON TECHNOLOGIES NORTH AMERCIA CORP. |
发明人 |
HAN JONGHEE;KIM JUNG PILL |
分类号 |
H03K5/00;H03K5/13;H03L7/06;H03L7/081;(IPC1-7):H03L7/06 |
主分类号 |
H03K5/00 |
代理机构 |
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地址 |
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