Signal Generator Settings
R&S
®
SGT100A
193
User Manual 1176.8674.02 ─ 07
"Fill"
Fills the table.
Fill both columns and then save the list. Otherwise the entries are
lost.
7.6.3.4
Polynomial Coefficients Settings
Alternatively to the look-up table, you can define the predistortion functions as a poly-
nomial function. The R&S
SGT calculates the AM/AM and AM/PM predistortion func-
tions and the required correction coefficients out of the defined polynomial.
To access the polynomial coefficients setting and define a higher-order polyno-
mial
1. Select "I/Q Mod > Digital Predistortion > AM/AM AM/PM".
2. Select "Digital Predistortion AM/AM AM/PM > Predistortion Settings".
3. Select "Shaping > Polynomial".
4. Select "AM/PM > Polynomial Coefficients"
Figure 7-23: Polynomial Coefficients: Understanding the displayed information
n
= Polynomial order
a0, b0, ... = Polynomial coefficients
1
= Ideal AM/AM function (the normalized amplitude is a line)
Applying Digital Predistortion