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Using the 8990B
2
Droop measurement view
The Droop measurement view is used to measure the amount of droop, A
of the
D
input signal as shown in
Figure
2-127. This function is only applicable for RF input
channels.
Figure 2-127
Droop measurement graph
Pulse amplitude, A
M
The pulse amplitude quantity is determined by the intersection of a line passing
through the points on the leading edge, where the instantaneous value reaches
10% and 90% of A
and a straight line that is the best least-squares fit to the
M
pulse in the pulse-top region (usually this is fitted visually rather than
numerically). For pulses deviating greatly from the ideal trapezoidal pulse shape,
a number of successive approximations may be necessary to determine A
.
M
Trailing edge (last transition) amplitude, A
T
The trailing edge amplitude quantity is determined by the intersection of a line
passing through the points on the trailing edge where the instantaneous value
reaches 90% and 10% of A
, and the straight-line segment fitted to the top of the
T
pulse in determining A
.
M
Droop, A
D
Droop is the difference between A
and A
. It is expressed in percentage of A
.
M
T
M
Keysight 8990B User's Guide
143
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