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Chapter 7 Plug-in Modules
44478A/B 1.3 GHz Dual 4-to-1 MUX Modules
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7
44478A/B 1.3 GHz Dual 4-to-1 MUX Modules
The Agilent 44478A and 44478B consist of two independent 4-to-1
multiplexers (group 00 and group 01) that provide bidirectional
switching. The module’s latching relays are configured in a “tree”
structure, to provide high isolation and low VSWR (voltage standing
wave ratio). Each channel can switch up to 42V dc + ac peak at
frequencies up to 1.3 GHz.
The 44478A is intended for 50 Ω impedance applications.
The 44478B is intended for 75 Ω impedance applications.
User connections for the channels are through BNC connectors on the
rear panel. Each channel has an SMB connector on the main PC board
used to connect resistive terminations and terminate unused channels.
The 3499A/B/C identifies this module as a 44472A on the front-panel
display. Changing the state of channels other than channels 00 through
03 or 10 through 13 does not generate an error, but has no effect.
Specifications for the 44478A/B are given on page 347.
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