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FUNCTIONAL DESCRIPTION
A functional block diagram is provided in Figure 2.1. The Multiplexer Module is powered by 3.3V and 5V inputs via
Compact PCI connector J1. The interface to the user test equipment is via the front panel mounted SMA coaxial
connectors. The module comprises a PCB populated with solid-state relays arranged as two SPDT terminated RF
switches. The relays are energised via control signals from relay drivers U50 and U51. The relay drivers are fed
with serial data from PCI bridge U1 via isolators U59 and U60. Module configuration is determined by data stored in
EEPROM U7, the PCI Bridge U1 is configured by EEPROM U2.
6 OFF SMA
COAX CONNECTORS
RL1 TO RL8
RELAY CONTACTS
DUAL SPDT TERMINATED SWITCH
Figure 2.1 - RF SPDT Switch Module 40-880A: Functional Block Diagram
SECTION 2 - TECHNICAL DESCRIPTION
RELAY CONTROL
RELAY
DRIVERS
U50, U51
50Ω SPDT TERMINATED 8GHz RF SWITCH 40-880A
SECTION 2 - TECHNICAL DESCRIPTION
DIGITAL
ISOLATORS
U59, U60
PCI
BRIDGE
MODULE
CONFIGURATION
U3
+5V
+3.3V
0V
TERMINATING
RESISTORS
R1 TO R12
U1
PCI BRIDGE
CONFIGURATION
U2
COMPACT PCI
BUS
CONNECTOR
J1
Page 2.1
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