Extending The Bandwidth; Test Setups - R&S SMW-K555 User Manual

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R&S SMW-K555

3 Extending the bandwidth

This chapter provides an overview on how to prepare, configure and operate the
R&S SMW for generation of extended bandwidth signals. It covers the following topics:
● Test
● Connecting the R&S
● Configuring the R&S
● Generating signals with extended

3.1 Test setups

This chapter provides an overview on test setups for bandwidth extension. Test setups
can include one or more R&S SMW vector signal generators. In this description, all test
setups also include a power combiner and a directional coupler.
For alignment of the RF output signal of R&S SMW, you can either use a power sensor
or a vector signal analyzer.
Power combiner
To combine RF signals of your test setup, you have to install a power combiner. For
correct operation, use a power combiner that supports the frequency range of your RF
output signal. For example, use the combiner kit R&S SMW-ZKK, if your test setup
generates RF signals with a maximum frequency of 40 GHz.
Directional coupler
To automate alignment of your test setup, you can use a directional coupler. For cor-
rect operation, use a directional coupler with an output coupling factor that is not higher
than 10 dB. For higher coupling factors, the coupling loss is too large to align power
levels.
Power sensor
To align the power levels for synchronization of the RF output signal ("Align RF Ports"),
use a diode sensor. Using thermal sensors can cause erroneous alignment. For exam-
ple, use a diode sensor of the R&S NRP family. You find the diode sensors on the
product page at:
www.rohde-schwarz.com/product/nrp_s_sn
Signal analyzer
To align the local oscillator (LO) phase for synchronization of the RF output signal
("Align Setup"), use a vector signal analyzer. For correct operation, make sure that this
analyzer supports an analysis bandwidth that fits your RF output signal. For example,
use an R&S FSW equipped with option R&S FSW-B4001 for analysis of up to 4 GHz
bandwidth signals. The minimum required equipment is R&S FSW-B2001 for analysis
of up to 2 GHz bandwidth signals. You find the signal analyzer on the product page at:
User Manual 1179.5776.02 ─ 01
setups..............................................................................................................12
SMW......................................................................................14
SMW......................................................................................17
Extending the bandwidth
bandwidth......................................................... 25
Test setups
12