
The
HP
85046A/B
and
HP
85047A
S-parameter
test
sets
con
tain
the
hardw
are
required
to
make
simultaneous
transmission
and
reection
measuremen
ts
in
b oth
the
forward
and
rev
erse
directions.
An
RF
path
switch
in
the
test
set
allo
ws
rev
erse
measuremen
ts
to
b e
made
without
c
hanging
the
connections
to
the
device
under
test.
T
est
Set
Step
A
ttenuator
The
70
dB
step
attenuator
con
tained
in
the
test
set
is
used
to
adjust
the
p o
w
er
lev
el
to
the
DUT
without
c
hanging
the
lev
el
of
the
inciden
t
p o
w
er
in
the
reference
path.
The
attenuator
in
the
HP
85046A/B
or
HP
85047A
test
set
is
con
trolled
from
the
fron
t
panel
of
the
analyzer
using
the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ATTENUATOR
PORT
1
or
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ATTENUATOR
PORT
2
softkeys
lo
cated
in
the
p o
w
er
men
u.
The
Receiv
er
Block
The
receiv
er
blo
c
k
con
tains
three
sampler/mixers
for
the
R,
A,
and
B
inputs.
The
signals
are
sampled,
and
do
wn-con
v
erted
to
pro duce
a
4
kHz
IF
(intermediate
frequency).
A
m
ultiplexer
sequen
tially
directs
eac
h
of
the
three
IF
signals
to
the
ADC
(analog
to
digital
con
v
erter)
where
it
is
con
v
erted
from
an
analog
to
a
digital
signal
to
b e
measured
and
pro cessed
for
viewing
on
the
display
.
Both
amplitude
and
phase
information
are
measured
simultaneously
,
regardless
of
what
is
display
ed
on
the
analyzer.
The
Microprocessor
A
micropro
cessor
takes
the
raw
data
and
p erforms
all
the
required
error
correction,
trace
math,
formatting,
scaling,
a
v
eraging,
and
marker
op erations,
according
to
the
instructions
from
the
fron
t
panel
or
o
v
er
HP-IB.
The
formatted
data
is
then
display
ed.
Required
P
eripheral
Equipment
In
addition
to
the
analyzer
and
the
test
set,
a
system
requires
calibration
standards
for
v
ector
accuracy
enhancemen
t,
and
cables
for
in
terconnections.
A
Close
Look
at
the
Analyzer's
Functional
Groups
The
op eration
of
the
analyzer
is
most
logically
describ ed
in
v
e
functional
groups.
Eac
h
group
consists
of
sev
eral
ma
jor
assem
blies,
and
p erforms
a
distinct
function
in
the
instrumen
t.
Some
assem
blies
are
related
to
more
than
one
group,
and
in
fact
all
the
groups
are
to
some
exten
t
in
terrelated
and
aect
eac
h
other's
p erformance.
P
o
w
er
Supply
.
The
p o
w
er
supply
functional
group
consists
of
the
A8
p ost
regulator
and
the
A15
preregulator.
It
supplies
p o
w
er
to
the
other
assem
blies
in
the
instrumen
t.
Digital
Con
trol.
The
digital
con
trol
group
consists
of
the
A1
fron
t
panel
and
A2
fron
t
panel
pro cessor,
the
A9
CPU,
the
A16
rear
panel,
the
A18
display
and
the
A19
graphics
system
pro cessor
(GSP).
The
A10
digital
IF
assem
bly
is
also
related
to
this
group.
These
assem
blies
com
bine
to
pro
vide
digital
con
trol
for
the
analyzer
and
an
HP
85047A
or
85046A/B
S-parameter
test
set
if
used.
Source.
The
source
group
consists
of
the
A3
source,
A7
pulse
generator,
A11
phase
lo
c
k,
A12
reference,
A13
fractional-N
(analog),
and
A14
fractional-N
(digital)
assem
blies.
The
A4
DRAFT
3/21/106
15:14
Theory
of
Operation
12-3
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