Shaping - R&S SGT100A User Manual

®
R&S SGT100A
Figure 7-22: Predistortion Settings > From Table: Understanding the displayed information
1a
2a
1b, 2b
white dashed line = Ideal zero correction function; no correction is necessary
yellow curve
3a, 3b
4
5
The dialog covers the settings for digital predistortion, like select and enabling an
AM/AM and/or AM/PM predistortion, select the way the predistortion function is
defined and specify the correction values.
Shaping....................................................................................................................... 188
Interpolation................................................................................................................ 189
Invert correction
Input Range (PEP
Pre-Gain......................................................................................................................190
Shaping
Polynomial
Normalized

Shaping

Selects the method to define the correction coefficients.
"From Table"
User Manual 1176.8674.02 ─ 07
= Normalized value of the current RF RMS power level
= Normalized value of the current PEP of the generated RF signal
= Correction values
= Predistortion function
= Input Range (PEP
= Positive correction coefficients to compensate values below the ideal ones
= Values greater than the
values............................................................................................... 189
).................................................................................................... 190
in
Table............................................................................................................. 191
Coefficients...............................................................................................191
Data......................................................................................................... 191
As value pairs in form of a shaping table.
Select "AM/AM or AM/PM Shaping Table" to access the settings, see
Chapter 7.6.3.3, "Edit Predistortion Table
Applying Digital Predistortion
)
in
PEPin Max are ignored
Signal Generator Settings
Settings", on page 191
188