Filter
Top Products
Chapter 7 155
Custom Real Time I/Q Baseband
Working with Burst Shapes
Using User-Defined Burst Shape Curves
You can adjust the shape of the rise time curve and the fall time curve using the Rise Shape and Fall
Shape editors. Each editor enables you to enter up to 256 values, equidistant in time, to define the shape of
the curve. The values are then resampled to create the cubic spline that passes through all of the sample
points.
The Rise Shape and Fall Shape editors are available for custom real-time I/Q baseband generator
waveforms. They are not available for waveforms generated by the dual arbitrary waveform generator.
You can also design burst shape files externally and download the data to the signal generator. For more
information, see the programming guide.
To Create and Store User-Defined Burst Shape Curves
Using this procedure, you learn how to enter rise shape sample values and mirror them as fall shape values
to create a symmetrical burst curve.
1. Press
Preset.
2. Press
Mode > Custom > Real Time I/Q Baseband > Burst Shape.
3. Press
Define User Burst Shape > More (1 of 2) > Delete All Rows > Confirm Delete Of All Rows.
4. Enter values similar to the sample values in the following table:
a. Highlight the value (1.000000) for sample 1.
b. Press
.4 > Enter.
c. Press
.6 > Enter.
d. Enter the remaining values for samples 3 through 9 from the table above.
e. Press
More (2 of 2) > Edit Fall Shape > Load Mirror Image of Rise Shape >
Confirm Load Mirror Image of Rise Shape.
This changes the fall shape values to a mirror image of the rise shape values.
Rise Shape Editor
Sample Value Sample Value
0 0.000000 5 0.900000
1 0.400000 6 0.950000
2 0.600000 7 0.980000
3 0.750000 8 0.990000
4 0.830000 9 1.000000