CMU Application Examples
1100.4903.12 4.101 E-10
CMU200
Signal-
generation
CMU-B17
RF configuration
incl.
level setting
RF
DUT
IQ InIQ Out
Fading
Simulator
BFS
The CMU 200 incl. option CMU-B17 can be used in combination with the IQ fading simulator R&S
ABFS for receiver tests under fading conditions. In this case the signal is routed to the DUT via the
CMU's RF interface.
Additional information for GSM:
To avoid unwanted influences on the fading profile it is highly recommended:
To set all timeslots to the same level.
To configure the TX signal of the CMU with the same RF frequencies and RF levels for both TCH and
BCCH.
To switch hopping off.
CMU200 as I/Q Generator and RF Analyzer
Another important application is the generation of IQ signals meeting the relevant standards. It is possi-
ble to generate complex signals that may even originate from a real signalling sequence. Most mobile
radio chipsets comprise an RF chip and a baseband chip that communicate with each other via an
analog IQ interface. The CMU-B17 IQ-interface can then be used to access the two chips. In mobile
radio development, different teams are often required for this purpose and the new testing feature via
the IQ interfaces allows development work to be divided in space and time.
IQ/IF scenario: Bypass w. I/Q IF OUT
RF IN
CMU200
IQ Out
Signal-
generation
CMU-
B17
RF OUT
IQ IN
DUT
(Transmitter)
Signal-
analysis
Receiver
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