Anritsu VectorStar ME7838 Series, Maintenance Manual

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Theory Of Operation 4-4 Functional Description of System Components
VectorStar ME7838 Series MM PN: 10410-00306 Rev. F 4-7
3739C Broadband Test Set
The 3739C Broadband Test Set performs the following tasks:
• Decoding the control logic sent from the MS464xB VNA
• Switching the RF signal between Port 1 and Port 2
• Leveling control of LO signals
• Amplifying RF and LO signals
• Multiplexing various level detector signals to MS464xB VNA
• Providing DC power for both Millimeter-Wave Modules
• Passing IF signals from Millimeter-Wave Modules to MS464xB VNA
• Option 3739C-003 adds the capability to switch the module bias to higher voltage to support longer
Millimeter-Wave Interface cables which is required for applications such as Antenna measurements.
Figure 4-5 shows the block diagram of the 3739C Test Set.
Both Port 1 and Port 2 LO Out ports have minimum power output at 5 to 10 GHz of +6 dBm in Modular/BB
mode (used when Anritsu 3743/3744 Series or MA25300A modules are installed) and at 8 to 22 GHz of
+17 dBm in mmW mode (used when OML/VDI Millimeter-Wave modules are installed). When used with the
MA25400A modules, the LO range is 5 to 19 GHz with a minimum output power of +10 dBm.
Figure 4-5. 3739C Test Set Block Diagram
Control PCB
Power
Supply
a1 IF
Out
b1 IF
Out
a2 IF
Out
b2 IF
Out
External I/O
To VNA
Ext ALC
From VNA
Ext Analog Out
RF
In
Port 1
LO
Out
Port 1
RF
Out
LO1
In
Port 1
IF In
Port 2
RF
Out
Port 2
LO
Out
LO2
In
Port 2
IF In
Port 2
Pwr &
Ctrl
Port 1
Pwr &
Ctrl
Port 2 Pwr & Ctrl Port 1 Pwr & Ctrl
LO Pwr Ctrl
LO Pwr Ctrl LO Pwr Ctrl
Lvl Det Lvl Det
IF Lvl Det
Doubler Module Doubler
Module
mmW LO Lvl Det
mmW LO Lvl Det
mmW LO Lvl Det
Module Bias
(Option 3739C-003)
Selector