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Multi-Instrument Setups
R&S
®
SMBV100B
468
User Manual 1178.4460.02 ─ 03
RF Envelope
In instruments equipped with option R&S
SMBV100B-K540, enables the output of a
control signal that follows the RF envelope. This control signal is provided for power
amplifiers envelope tracking testing. The signal is output at the I/I Bar connectors.
The envelope tracking (ET) is a method used by modern power amplifiers (PA) to
improve their efficiency, especially when amplifying high crest factor RF signals. With
envelope tracking, the PA estimates, i.e. "tracks", the RF signal and varies the supply
voltage at the end amplifying stage synchronous to the changes in the RF signal.
See user manual R&S
SMBVB-K540, R&S
SMBVB-K541 Envelope Tracking and
AM/AM, AM/PM Predistortion.
Remote command:
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:STATe
Show Connector
Accesses a dialog that displays the physical location of the selected connector on the
front/rear panel of the instrument.
I/Q Output Type
Selects the type of output signal.
The provided parameters in the "I/Q Analog Outputs" dialog depend on the selected
output mode.
"Differential"
Option: R&S
SMBVB-K17
●
If "RF Envelope > On"
The inverted envelope signal
Ē
is output at the I Bar connectors.
●
If "RF Envelope > Off"
The analog I/Q signal components are output at the I/Q Bar con-
nectors.
"Single-Ended"
●
If "RF Envelope > On"
The envelope signal E is output at the I connectors.
●
If "RF Envelope > Off"
Single-ended output at the I/Q connectors.
You can define a bias between the output signal and ground.
Remote command:
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:TYPE
Mode
Selects the mode for setting the outputs, independent or together.
"Fixed"
The I/Q signal components settings are predefined fix values:
●
"Bias (EMF)" = "Offset (EMF)" = 0V
●
"I/Q Level Vp (EMF)"
–
Single ended mode: "I/Q Level Vp (EMF)" = 1 V
–
Differential mode: "I/Q Level Vp (EMF)" = 2 V
"Variable"
Option: R&S
SMBVB-K17
Enables modification of the I/Q signal components settings.
I/Q Analog Output Settings