Specifications

Receiver Module
Configurations,
MS462XD
The front end consists of the following items:
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Auto-Reversing Modules (two each)
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Port Modules (four each)
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Port 1 Step Attenuator
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Source 1 Switched Doubler Module (6 GHz units only) or
Source 1 Switched Tripler Module (9 GHz units only)
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Source 2 Switched Doubler Module (6 GHz units only) or
Source 2 Switched Tripler Module (9 GHz units only)
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High Isolation Switch Module
The 10 MHz to 3 GHz signal from the Source 1 Module is routed to the
Auto-Reversing Module 1. For operation above 3 GHz, the Source 1 signal
is doubled in 6 GHz models or tripled in 9 GHz models prior to sending it
to the Auto-Reversing Module 1.
In the Auto-Reversing Module 1, a coupler provides a signal path for the
built-in level detector that provides a DC signal for the ALC circuits lo
-
cated in the Source 1 Module. Then the source signal is switched between
two paths and is routed to the front panel Port 1 and Port 2 connectors re-
spectively. The switching is controlled by the Central Processor Module.
Two couplers on these two paths provide samples of these stimulus sig-
nals that feed the reference input of the Down Conversion Module. The
stimulus signals are then output to the DUT via the Port 1 Module and
Port 2 Module mounted directly to the Port 1 and Port 2 front panel con-
nectors.
Both Port Modules have integrated bias tees that accept user supplied DC
bias signals for Port 1 and Port 2 from the rear panel input connectors.
The bias signals are injected into the center conductors of the Port 1 and
Port 2 connectors along with the stimulus signal on either Port 1 or
Port 2. This feature can be used for test devices that require bias on their
connector center conductors. The MS462XX allows the bias signals and
the RF stimulus signal to be independently turned off while in Hold oper
-
ating mode.
The Port 1 stimulus signal can be attenuated in 10 dB steps via the
0 to 70 dB Step Attenuator that is part of the Port 1 source signal path.
The stimulus signal cannot be attenuated when routed out of Port 2,
Port 3 or Port 4.
The 10 MHz to 3 GHz signal from the Source 2 Module goes through a
similar route as the Source 1 Module. The stimulus signal is routed to the
Auto-Reversing Module 2. For operation above 3 GHz, the Source 2 signal
is doubled in 6 GHz models or tripled in 9 GHz models prior to sending it
to the Auto-Reversing Module 2.
THEORY OF OPERATION FRONT END RF COMPONENTS
MS462XX MM 2-19