Delay fabric apparatus and delay line
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United States of America Patent
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Nov 1, 2016
Grant Date -
Jul 17, 2014
app pub date -
Jan 14, 2014
filing date -
Jan 16, 2013
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Abstract
A fabric for delaying digital signals in continuous time has an array of node filters. Inputs of filters in the first column are inputs of the fabric. A node filter has a delay element and a cross-coupling element, whose output signals are added or subtracted to form an output signal of the filter. A node filter in a row is concatenated to the previous filter in the row through its delay element. Inputs of cross-coupling elements are connected to other rows of the array. Outputs of node filters form the outputs of the fabric. Delay times of delay elements and cross-coupling elements are nominally equal. Drive strengths of cross-coupling elements may be lower than drive strengths of delay elements. A delay line is constructed by combining a phase generator and a fabric, where the phase generator splits a digital input signal in multiple incrementally delayed versions for the fabric inputs.
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