Threshold
Middle Value
Threshold
Upper Limit
Rise Time Fall Time
+Width
- Width
Period
Threshold
Lower Limit
Figure 9.1 Time Parameters
1. Period: defined as the time between the middle threshold points of two
consecutive, like-polarity edges.
2. Frequency: defined as the reciprocal of period.
3. Rise Time: indicates the time for the signal amplitude to rise from the threshold
lower limit to the threshold upper limit.
4. Fall Time: indicates the time for the signal amplitude to rise from the threshold
upper limit to the threshold lower limit.
5. +Width: indicates the time between the threshold middle value of a rising edge to
the threshold middle value of the next falling edge.
6. -Width: indicates the time between the threshold middle value of a falling edge to
the threshold middle value of the next rising edge.
7. +Duty: indicates the ratio of the positive pulse width to the period.
8. -Duty: indicates the ratio of the negative pulse width to the period.
9. Tvmax: indicates the time that corresponds to the maximum value of the
waveform (Vmax).
10. Tvmin: indicates the time that corresponds to the minimum value of the waveform
(Vmin).
Operations and Measurements
174
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