Measurement apparatus and electronic device
View Patent ↗Provided is a measurement apparatus that measures an input signal, comprising a plurality of first comparators that each receive the input signal, have a common first reference level set therein, and compare a signal level of the input signal to the first reference level; and a level-crossing timing detecting section that detects a level-crossing timing at which the signal level crosses the first reference level, based on comparison results of the first comparators.
1. A measurement apparatus that measures an input signal, comprising: a plurality of first comparators that each receive the input signal, and that each have a common first reference level set therein, wherein each of the plurality of first comparators compares a signal level of the input signal to the first reference level; and
a level-crossing timing detecting section that detects a level-crossing timing at which the signal level crosses the first reference level, based on comparison results of the outputs of the first comparators.
2. The measurement apparatus according to claim 1 , wherein
each first comparator outputs, as the comparison result, a logic value indicating which of the first reference level and the signal level of the input signal is greater, and
the level-crossing timing detecting section detects a timing at which a ratio of comparison results that indicate a predetermined logic value, from among the comparison results of the first comparators, matches a predetermined reference ratio.
3. The measurement apparatus according to claim 2 , wherein
the level-crossing timing detecting section detects a timing of the reference ratio by performing an interpolation using ratios detected at two timings that sandwich the timing at which the reference ratio is realized.
4. The measurement apparatus according to claim 3 , wherein
the level-crossing timing detecting section sets a range of a linear region corresponding to each of the reference levels.
5. The measurement apparatus according to claim 1 , further comprising a plurality of second comparators that each receive the input signal, and that each have a common second reference level set therein, wherein each of the plurality of second comparators compares the signal level of the input signal to the second reference level, and wherein the level-crossing timing detecting section further detects a level-crossing timing at which the signal level crosses the second reference level, based on comparison results of the outputs of the second comparators.
6. The measurement apparatus according to claim 5 , further comprising a voltage sampler that detects the signal level of the input signal by comparing the signal level of the input signal to a reference signal level that is greater than the first and second reference levels or to a reference signal level that is less than the first and second reference levels.
7. The measurement apparatus according to claim 5 , further comprising a digitizing section that digitizes a waveform of the input signal based on each reference level and timings at which the input signal level crosses each of the reference levels.
8. An electronic device comprising the measurement apparatus according to claim 1 .