Patent ID: 6574168
Filing Date: 2003-06-03
Classification: G04F

Abstract:
A time measuring device comprising:an input signal detecting unit operable to detect three or more edges in an input signal and to output three or more detection signals in parallel, said three or more detection signals changing based on said three or more edges, respectively; a converting unit operable to convert phase differences between change timings of said detection signals and clock edges in a reference clock having a predetermined operating frequency into analog voltage values, respectively; a counting unit operable to count, from change timings of at least two of said detection signals, numbers of said clock edges between said clock edges from which said at least two detection signals are respectively delayed by said phase differences corresponding to said at least two detection signals; an operating unit operable to calculate a time interval between edges of said three or more edges based on said analog voltage values and said numbers of clock edges.