Apparatus and method for selecting a tap range in a digital dela

Details Apparatus and method for selecting a tap range in a digital dela Apparatus and method for selecting a tap range in a digital dela

1995-03-30

1996-07-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327152, 327161, 331 57, 375376, 375374, H03L 700

Patent

active

055370691

ABSTRACT:
The invention is a delay locked loop circuit comprising a delay line with an input signal and a plurality of tap outputs, and a selector to select from a range of tap outputs. Each tap outputs a delayed copy of the input signal. The invention further comprises a comparator to compare the input signal to an ouput signal, and to output an indication of the phase difference between the signals. A detector coupled to the tap outputs detects a transition from a first predetermined signal level output by a first tap output to a second predetermined signal level output by a second tap output. The detector outputs an indication of the tap outputs between which the transition first occurs to a range determiner. The determiner determines a range of tap outputs to select from and outputs the determined range to the selector. The selector selects a tap output within the range, the selected tap output becoming the output signal.

REFERENCES:
patent: 5081655 (1992-01-01), Long
patent: 5101117 (1992-03-01), Johnson et al.
patent: 5103185 (1992-04-01), Arai
patent: 5157277 (1992-10-01), Tran et al.
patent: 5223755 (1993-06-01), Richley
patent: 5315271 (1994-05-01), Pascual et al.
patent: 5317202 (1994-05-01), Waizman
patent: 5329254 (1994-07-01), Takano

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