CMU Instrument Design and Function Description
1100.4903.82 3.13 E-4
BOARD1 directly via a MMCX connector (IF3RX1) and converts it into
a 12-bit data stream by means of a fast AD converter.
DDC MODULE1
The sandwich DDC MODULE1 is directly plugged onto the DIGITAL
BOARD via three multipoint connectors and processes the digital data
stream of the receiver. In a special ASIC chip, the I/Q shaping, the
matching of the data rate and the respective filtering (bandwidth
shaping) of the digital data stream are produced. Then follows a DSP
(RX DSP) with further evaluation of the digital I/Q data for
measurement purposes. Besides, the digital I/Q data are passed on via
the MOTHERBOARD1 to the LINKHANDLER MODULE for evaluation.
TXDSP MODULE1
The sandwich TXDSP MODULE1 is directly plugged onto the DIGITAL
BOARD via two multipoint connectors. It contains the DSP on the
transmitter side (TXDSP), which generates I/Q data according to the
application and provides them to the AUC MODULE1 via two 12-bit
D/A converters and several selection switches located on the DIGITAL
BOARD.
AUC MODULE1
The sandwich AUC MODULE1 is directly plugged onto the DIGITAL
BOARD via a multipoint connector and serves the purpose of filtering
the analog I/Q data from the TXDSP MODULE1 or the LINKHANDLER
MODULE depending on the position of the selection switches on the
DIGITAL BOARD according to the application (bandwidth shaping) and
converting it to the transmit IF (13.85 MHz) by means of an I/Q
modulator. Subsequently, the transmit IF is routed via the MMCX
connector (IF3TX1) on the DIGITAL BOARD to the RXTX BOARD1.
Extension
The DIGITAL BOARD can be extended by a further complete receive
and transmit channel consisting of ADC MODULE2, DDC MODULE2,
TXDSP MODULE2 and AUC MODULE2.
Option UNIVERSAL SIGNALLING UNIT CMU-B21
The UNIV. SIGN. UNIT MODULE is the control and measurement module which contains all circuit
parts for signaling and measuring network-specific parameters.
To this end, the digital I/Q data from the DIGITAL BOARD are used on the receiver side (RX) in order to
calculate test parameters.
On the transmitter side, analog network-specific I/Q data are generated and provided to the AUC
MODULE1 on the DIGITAL BOARD.
Design
The UNIV. SIGN. UNIT MODULE is designed as plug-in module with
two aluminum shell covers. It is equipped with a screwed-on aluminum
cover both at the front and rear to allow for optimal electrical shielding
of the module.
Cooling system
The casing is provided with ventilation holes on the right and left in
order to produce a large cooling flow through the module by means of
the instrument fan.
This efficient cooling is necessary, since a great number of highly
integrated fast digital devices is used on the module and up to seven
sandwich modules can additionally be fitted so that the module is
densely packed.
To Next Page
Loading...
Need help?
General
