Keysight E8663D, Руководство пользователя

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Keysight E8357D/67D & E8663D PSG User’s Guide 221
Custom Real Time I/Q Baseband
Working with Burst Shapes
Working with Burst Shapes
— “Configuring the Burst Rise and Fall Parameters” on page 222
— “Using User–Defined Burst Shape Curves” on page 223
The Burst Shape menu enables you to modify the rise and fall time, rise and fall
delay, and the burst shape (either sine or user file defined). In addition, you can
define the shape of the burst and preview the burst shape through a Rise
Shape Editor, or restore all of the burst shape parameters back to their original
default state.
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.
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: