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Real-Time I/Q Baseband Generator User’s and Programming Guide 2-7
HP ESG Family Signal Generators Using Functions
Options UN8 and 202 Customizing the Burst Shape
Customizing the Burst Shape
The default burst shape of each format is implemented according to the standards of the
format selected. You can, however, modify the following aspects of the burst shape:
• Rise time - the period of time, specified in bits, where the burst increases from a
minimum of
−
70 dB (0) to full power (1).
• Fall time - the period of time, specified in bits, where the burst decreases from full
power (1) to a minimum of
−
70 dB (0).
• Rise delay - the period of time, specified in bits, that the start of the burst rise is
delayed. Rise delay can be either negative or positive. Entering a delay other than zero
shifts the full power point earlier or later than the beginning of the first useful symbol.
• Fall delay - the period of time, specified in bits, that the start of the burst fall is delayed.
Fall delay can be either negative or positive. Entering a delay other than zero shifts the
full power point earlier or later than the end of the last useful symbol.
• User-defined burst shape - up to 256 user-entered values which define the shape of the
curve in the specified rise or fall time. The values can vary between 0 (no power) and
1 (full power) and are scaled linearly. Once specified, the values are resampled as
necessary to create the cubic spline that passes through all of the sample points.
Try the following procedures which demonstrate customizing the burst shape.
NOTE
For further information on burst shape, see “ Burst Shape:
The Effects of Symbol Rate & Modulation Type ” on page 6-6.
0
1
Po
w
e
r
Rise
Delay
Rise
Time Fall
Time
Fall
Delay
Time
User-Defined
Values
User-Defined
Values