Theory of Operation
Overall Functional Description 2
2-3
RF Output PCA
Front Panel
Assembly
Synthesizer PCA
Digital
PCA
Power Supply
PCA
Interconnection
PCA
Leveling Head
Assembly
(50 or 75 Ohm)
1 mHz - 4 GHz
External Reference I/O
External AM/FM input and Sweep Trigger I/O 300Mhz frequency counter to 27GHz Control PCA
Isolated (floating)Ground (earth) Referenced
Display
Backlight
Optical
Isolators
10 MHz
OCXO
Isolation
Transformer
2.7 GHz - 4 GHz
20 kHz - 15.625 MHz
1 GHz - 2.7 GHz
SMPS
Switches
GPIB
RS232
Line Power
60Vpp
62.5 MHz - 125 MHz
(FM only)
HF/LF
Level
Sense &
Control
Data
RF Output
Control Data
27 GHz
Control
PCA
27 GHz
Multiplier
Power Block
Attenuators
78dB
10 MHZ Clock
Divide Mux,
Filter, &
Amplify
Level Control
Output
Attenuators
60dB
48 V dc, Line Freq, and Power Fail
Mains SMPS
Assembly
Frequency
Synthesis
Trapezoid
Generator
30V & -8V2
supplies
Digital
supplies
+5V & +12V
Low-Voltage
Transformer
Side
Fans
Data
Floating
Power
Supplies
Power
Output
Routing
REAR PANEL
Rear
Fan
Head
Output
Power Sensors
Interfaces 1 & 2
4G-
8GHz
Microwave
Output
Keypad
PCA
USB
hpn385.eps
Figure 2-2. Overall Functional Block Diagram (96270A)
User Interface
Operator interaction with the Instrument starts at the Front Panel. The Front
Panel includes a keypad used to input Instrument configuration and control data,
and a display showing RF output signal parameters and instrument status. The
keypad switches, display, and USB socket (96270A) are mounted in a plastic
Bezel Assembly. The Digital PCA scans the keypad switch matrix and sends
display data via a flat flexible ribbon cable. The rear panel GPIB socket provides
remote control and is routed through the Interconnection PCA to the Digital PCA
via a long ribbon cable. The rear-panel serial port signals, used for firmware
updates, and signals from rear switches also go through the Interconnection
PCA.
The two power sensor interface connectors (96270A), on the left of the front
panel, are routed to controllers on the Digital PCA. Electrically they are
connected to the floating RF Common of the instrument, which is isolated from
the chassis.
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