Specification; Envelope Shaping And Shaping Methods - R&S SGT100A User Manual

®
R&S SGT100A
7.5.2.2
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 conform with the MIPI
Interface for Envelope Tracking Specification".
Table 7-5: Default parameters per eTrak
Parameter
I/Q output Type
Bias
Vpp Max
Vcc Max
Bipolar Input
7.5.2.3

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
Table 7-6: Definition of the variable x depending on the envelope voltage adaptation mode
"Envelope Voltage Adaptation"
Auto Power
Auto Normalized
Manual
The mathematical expressions and further information on the shaping functions are
provided in the corresponding sections.
User Manual 1176.8674.02 ─ 07
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
®
Alliance specification "Analog Reference
®
Interface Type
1.5 Vpp
Differential
600 mV
1.5 V
1.5 V
On
on page 149)
on page 149)
on page 150)
on page 151)
on page 152)
x
x = V - V
in in, min
x ≥ 0
x = V /V
in in,max
x = V /V
Env Env,max
Signal Generator Settings
®

Specification

®
interface types so that
2 Vpp
Differential
900 mV
2 V
2 V
On
Table 7-6.
148