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373XXA MM 7-5
SYSTEM DESCRIPTION SYSTEM OVERVIEW
A/D
S/H
S/H
ANALOG
MUX
S/H
S/H
S/H
CTL
EXTERNAL
KEYBOARD
A/D BUS
QUIET BUS
VME
INTERFACE
TOANALOG PCB'S
(CTL & DATA)
S/H
S
S
S
D
D
D
YIG
PORT 1
PORT 2
bias tee
bias tee
* pad values:
a channels b channels
37347B and below 20dB 6db
37369B 6dB
3db
SDM
LOCK
DET
QUAD
SAMPLER/BUFFER
IF / SYNC/ DET
FLTR / S/H /A/D
2X
F
LVL
DET
LVL
DET
F
R
R
0-40dB
StepAttenuator
ALC
SWITCHED
FILTER
DOWN
CONV
SIGNAL SOURCE
TEST SET MODULE**
DOUBLER
YIG OSC
2-20 GHz
0-70dB
StepAttenuator
FPAmp Loop
µP
µP
µP
68030
S
S
b
b Loop
a Loop
a
a
b
1
1
1
1
2
2
S
S
HARM
GEN
L.O.
#1
L.O.
#2
L.O.
#3
REF OSC
10 MHz
I/O CONTROL
LOGIC
QUIET BUS
INTERFACE
&
CONTROL
A/D BUS
INTERFACE
&
CONTROL
EXTERNAL
KEYBOARD
INTERFACE
I/O PCB'S
FRONT
PANEL
INTERFACE
FLOPPY
DISK DRIVE
CONTROL
REAR PANEL
INTERFACE
&
CONTROL
FLOPPY
DISK
DRIVE
HARD
DISK
DRIVE
RAM
INTERFACE
CTL
GRAPHICS
PROCESSOR
PCB
INTERNAL
VGA
MONITOR
EXT VGAMONITOR
R.P.
LOGIC
CKTS
REAR
PANEL
PCB
GPIB
INTERFACE
VME BUS
MAIN PROCESSOR PCB
BBRAM
FRONT
PANEL
PCB
*
*
*
*
** For Models 37377Aand 37397A, see Figures 5-3 and 5-4
Figure 7-1. Overall Block Digram of 373XXA VNA System
*Model 37369A only