Timing Definitions
Once the edges and transition points have been defined, timing
measurements are made. Timing measurements are made on the first rising
or falling edge on the display.
•
Rise time = time at the upper threshold
−
time at the lower threshold on
the first rising edge
•
Fall time = time at the lower threshold
−
time at the upper threshold on
the first falling edge
•
Period = If the first edge is rising
then period = mid-threshold crossing of second rising edge
−
mid-threshold crossing of first rising edge
else period = mid-threshold crossing of second falling edge
−
mid-threshold crossing of first falling edge
•
Frequency = 1/period
•
+Width = if first edge is rising
then +width = mid-threshold crossing of first falling edge
−
mid-threshold crossing of first rising edge
else +width = mid-threshold crossing of second falling edge
−
mid-threshold crossing of first rising edge
•
−
Width = if first edge is rising
then
−
width = mid-threshold crossing of second rising edge
−
mid-threshold crossing of first falling edge
else
−
width = mid-threshold crossing of first rising edge
−
mid-threshold crossing of first falling edge
•
Duty Cycle = (+width/period)(100)
Measurements
Timing Definitions
13–16
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