| 摘要 |
A tunable delay unit and methods of tuning are provided, comprising a plurality of first delay elements and a plurality of first delay element taps between the first delay elements, wherein the first delay element taps are inputs to a first multiplexer and wherein the output of the first multiplexer is selected from among the inputs according to a first tap select input, further comprising a plurality of second delay elements connected in series to the output of the first multiplexer and a plurality of second delay element taps between the second delay elements, wherein the second delay element taps are inputs to a second multiplexer and wherein the output of the second multiplexer is selected from among the inputs according to a second tap select input, the output of the second multiplexer forming the output of the programmable delay unit. The programmable delay unit provides for highly accurate calibration of timed circuits, in particular delay lines.
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