Display Power
The A8 assembly supplies
+5
VCPU to the
A19
GSP through the motherboard.
The GSP converts a portion of the
+5
VCPU to 3.3 V to drive the display and
LVDS (low voltage differential signaling) logic The A19 GSP
also
controls and
supplies power to the A27 backlight inverter. The voltages generated by the
inverter are then routed to the display. Display power is not connected to the
protective shutdown circuitry so that the
Al8
display assemblies can operate
during troubleshooting when other supplies do not work.
Note
If blanking pulses from the A19 GSP are not present, then
+3.3 V will not be sent to the display.
Probe Power
The + 18 V and -18 V supplies are post regulated to + 15 V and -12.6 V
to provide a power source at the front panel for an external RF probe or
millimeter modules.
Digital Control Theory
The digital control functional group consists of the following assemblies:
H
Al front panel
n
A2 front panel processor
n
A9 CPU
n
A10 digital IF
n
Al6
rear panel
n
Al8
display
n
A19 GSP
w
A27
Inverter
These assemblies combine to provide digital control for the entire analyzer.
They provide math processing functions, as well as communications between
the analyzer and an external controller and/or peripherals Figure 12-3 is a
simplified block diagram of the digital control functional group.
124
Theory of Operation
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