| 摘要 |
An apparatus for measuring time interval between two selected edges of a clock signal includes an edge generator, a first multi-tap delay module, a second multi-tap delay module, and a multi-element phase detector. The edge generator produces a first edge at a first output node and a second selected edge at a second output node. First multi-tap delay module provides a first constant incremental delay at each tap to the first edge. Second multi-tap delay module provides a second constant incremental delay at each tap to the second selected edge. Each element of the multi-element phase detector has a first input terminal and a second input terminal. The first input terminal is coupled to a selected tap of the first multi-tap delay module and the second input terminal is coupled to a corresponding tap of the second multi-tap delay module. The output terminals of the multi-element phase detector provide the value of the time interval.
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