Shaping Table; Normalized Data - R&S SGT100A User Manual

®
R&S SGT100A

Shaping Table

In the R&S SGT, there are two ways to define the predistortion function in form of a
shaping table:
●
Externally
Create a correction table file as a CSV file with Microsoft Excel, with a Notepad or
a similar tool, save it with the predefined extension, transfer it to and load it into the
instrument.
See also
●
Internally
Use the built-in editor table editor, see
Settings",
File format of the correction table file
The correction table files are files with predefined extension and simple file format, see
Table
Table 7-12: Shaping table files: format and extensions
Predistortion model
AM/AM
AM/PM
The header is optional. The file content is a list of up to 4000 comma-separated value
pairs, describing the delta values for amplitude or phase related to the absolute input
power P
For values above the selected
a linear ratio of the input to output power.
Example: Shaping table file content (*.dpd_magn file)
# Rohde & Schwarz - Digital AM/AM Predistortion Table
Pin[dBm],deltaPower[dBm]
-30,0.5
3,-0.01

Normalized Data

In the R&S SGT, there are two ways to define the predistortion function as normalized
data:
●
Externally
We recommend that you calculate the normalized correction data by a connected
R&S
Measurements option.
You can also create the correction table file as a CSV file with Microsoft Excel, with
a Notepad or a similar tool, save it with the predefined extension, transfer it to and
load it into the instrument.
User Manual 1176.8674.02 ─ 07
"File format of the correction table file"
on page 191.
7-12.
File extension
*.dpd_magn
*.dpd_phase
; a new line indicator separates the pairs.
in
®
FSW equipped with R&S
on page 182.
Chapter 7.6.3.3, "Edit Predistortion Table
Header (optional)
# Rohde & Schwarz - Digital AM/AM
Predistortion
Table Pin[dBm],deltaPower[dB]
# Rohde & Schwarz - Digital AM/PM
Predistortion
Table Pin[dBm],deltaPhase[deg]x
Input Range (PEP ), the predistortion function assumes
in
®
FSW-K18 Power Amplifier and Envelope Tracking
Signal Generator Settings
Applying Digital Predistortion
182