Phase shifter with reduced linear dependency
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United States of America Patent
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Apr 21, 2009
Grant Date -
Dec 27, 2007
app pub date -
Aug 27, 2007
filing date -
Nov 23, 1999
priority date (Note) -
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Abstract
A method is disclosed for the automated synthesis of phase shifters. Phase shifters comprise circuits used to remove effects of structural dependencies featured by pseudo-random test pattern generators driving parallel scan chains. Using a concept of duality, the method relates the logical states of linear feedback shift registers (LFSRs) and circuits spacing their inputs to each of the output channels. The method generates a phase shifter network balancing the loads of successive stages of LFSRs and satisfying criteria of reduced linear dependency, channel separation and circuit complexity.
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