Signal Generator Settings
R&S
®
SGT100A
151
User Manual 1176.8674.02 ─ 07
About the Shaping Table
The envelope shaping table is a widely used method to define the shaping function.
This kind of definition is suitable if you have knowledge on or aim to achieve an exact
relation between supply voltage and RF input power. For example, with suitable set-
tings, the shaping table can precisely describe the transition region of the PA.
You can receive information on suitable envelope shaping values form the power
amplifier manufacturer.
In the R&S
SGT, there are two ways to define a shaping table function:
●
Externally
Create a shaping 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
"File format of the shaping table file"
●
Internally
Use the built-in editor table editor, see
Chapter 7.5.6, "Edit I/Q Envelope Shape
File format of the shaping table file
The shaping table files are files with predefined extension and simple file format, see
.
Table 7-7: Shaping table files: format and extensions
"Envelope Voltage Adaptation"
File extension
Header (optional)
Auto Power
*.iq_lutpv
# Rohde & Schwarz - IQ Output
Envelope Shaping Table
# Power[dBm],Vcc[V]
Auto Normalized/Manual
*.iq_lut
# Rohde & Schwarz - IQ Output
Envelope Shaping Table
# Vin/Vmax,Vcc/Vmax
The header is optional. The file content is list of up to 4000 comma-separated value
pairs; a new line indicator separates the pairs.
Example: Shaping table file content (*.iq_lut file)
# Rohde & Schwarz - IQ Output Envelope Shaping Table
# Vin/Vmax,Vcc/Vmax
0.3,0.4
0.35,0.45
0.56,0.55
0.4,0.5
0.6,0.65
0,0.135
Generation of Envelope Tracking Signals
