Emerson R&S SGT100A User Manual page 167

®
R&S SGT100A
are the supply voltage V
range and the gain characteristics of the external DC modulator.
You find the required values in the documentation of your power amplifier, for
example in its data sheet.
●
Manual Envelope Voltage Adaptation:
In this mode, you can also define the operating range of the power amplifier based
on a pre-gain and a post-gain range. Based on these values, the instrument calcu-
lates the supply voltage V
All modes support envelope shaping.
6.5.2.2
Signal parameters for testing according to the eTrak
In the R&S SGT, you can select one of the predefined eTrak
the generated signal is conformed with the MIPI
ence Interface for Envelope Tracking Specification".
Table 6-3: Default parameters per eTrak
Parameter
I/Q output Type
Bias
Vpp Max
Vpp Max
Bipolar Input
6.5.2.3 Envelope shaping and shaping methods
Envelope shaping is a method that uses functions to describe the relationship between
supply voltage and RF input power. An envelope-shaping function is a trade-off
between effectivity and improved linearity of the PA.
In the R&S SGT, you can select the way you define the shaping function. You can
choose between:
●
2 predefined simple linear functions
(see
●
3 detroughing functions with a configurable factor
(see
●
A polynomial function with up to 10 polynomial coefficients
(see
●
A shaping function defined as a shaping table
(see
●
To set the correction values in raw format with a single remote control command
(see
The linear, the detroughing and the polynomial shaping functions are mathematical
expressions that are described as function of the variable x, see
User Manual 1176.8674.02 ─ 12
, the input power PEP
cc
.
cc
1.2 Vpp
Differential
500 mV
1.2 V
1.2 V
On
"About the linear functions"
"About the detroughing function"
"About the polynomial function"
"About the shaping table"
"Shaping function in raw data format"
Generation of envelope tracking signals
required for working in the linear
in
®
®
Alliance specification "Analog Refer-
®
Interface Type
1.5 Vpp
Differential
600 mV
1.5 V
1.5 V
On
on page 168)
on page 169)
on page 169)
on page 170)
on page 171)
Signal generator settings
specification
®
interface types so that
2 Vpp
Differential
900 mV
2 V
2 V
On
Table 6-4.
167