Rohde & Schwarz SMW200A - 6 Applying I;Q Vector Modulation

Applying I/Q Vector Modulation
R&S
®
SMW200A
415User Manual 1175.6632.02 ─ 16
6 Applying I/Q Vector Modulation
The R&S SMW offers I/Q modulation with an external analog I/Q signals, external digi-
tal signals, and the internally generated digital signal.
For a description on the signal impairment functionality and settings for applying non-
linear effects, see:
●
Chapter 5.3, "Impairing the Signal", on page 406
See user manual R&S
®
SMW-K540, R&S
®
SMW-K541 Envelope Tracking and AM/AM,
AM/PM Predistortion.
See user manual R&S
®
SMW-K544 User-Defined Frequency Response Correction.
6.1 Required Options
The equipment layout for I/Q modulation includes:
●
One of the Frequency options RF path A (R&S SMW-B1xx)
Sufficient for I/Q modulation with external analog signal
●
Option Standard or Wideband Baseband Generator (R&S SMW-B10/-B9) per sig-
nal path and
– Option Baseband main module, one/two I/Q paths to RF (R&S SMW-B13/-
B13T)
Sufficient for I/Q modulation with internal and external digital signal
– Or option Wideband baseband main module two I/Q paths to RF (R&S SMW-
B13XT)
(I/Q modulation with internal digital signal)
●
Option Differential I/Q Inputs (R&S SMW-K739), for RF path A
Required for I/Q modulation with external differential analog signal
6.2 About the I/Q Modulator
The R&S SMW offers I/Q modulation with the internally generated digital signal, the
external digital signals (when separately processed), and an external analog I/Q signal.
The maximum available RF bandwidth of externally applied wideband analog signal is
higher than the bandwidths of the internal or external digital signal. For exact values,
refer to the instrument specification (data sheet).
Analog I/Q input signals are directly applied to the analog I/Q modulation circuit, and
are not routed through the baseband section of the R&S SMW.
Defining the input signal of the I/Q modulator
The Table 6-1 gives an overview of the possible input signals and the connectors they
are supplied at. Any of the specified input signals is processed by the I/Q modulator
About the I/Q Modulator