
Signal
Separation
External
T
est
Sets
The
HP
85047A
S-parameter
test
set
con
tains
a
switched
frequency
doubler
to
double
the
HP
8753C
source
frequency
.
A
p ortion
of
the
RF
signal
is
coupled
to
the
analyzer
R
input
for
reference.
(F
or
an
HP
8753D
Option
011
com
bined
with
Option
006,
the
frequency
doubler
is
b
ypassed
since
the
analyzer's
source
is
capable
of
generating
a
sw
ept
RF
signal
up
to
6
GHz.)
The
remaining
signal
is
routed
through
a
70
dB
programmable
step
attenuator
to
the
directional
couplers
for
reection
and
transmission
measuremen
ts.
The
couplers
allo
w
detection
of
the
signal
from
300
kHz
to
6
GHz.
These
couplers
pro
vide
low
insertion
loss
b et
w
een
the
RF
input
and
the
test
p orts.
Tw
o
bias
tees
supply
external
biasing
for
active
devices.
An
HP
8753D
Option
006/011
is
required
for
use
with
the
HP
85047A
test
set.
Figure
12-9a
sho
ws
a
simplied
blo
c
k
diagram
of
the
HP
85047A.
The
HP
85046A/B
S-parameter
test
set
con
tains
a
p o
w
er
splitter
to
div
ert
a
p ortion
of
the
inciden
t
signal
to
the
R
input
of
the
analyzer
for
reference.
The
remainder
of
the
inciden
t
signal
is
routed
through
a
switch
to
one
of
t
w
o
directional
bridges
at
the
measuremen
t
p orts.
The
RF
path
switch
is
con
trolled
b
y
the
analyzer
to
enable
switching
b et
w
een
forward
and
rev
erse
measuremen
ts.
A
70
dB
step
attenuator
in
the
test
set,
also
con
trolled
from
the
analyzer,
adjusts
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.
Tw
o
bias
tees
are
included,
for
external
biasing
of
active
devices
connected
to
the
test
p orts.
Figure
12-9 b
sho
ws
a
simplied
blo
c
k
diagram
of
the
HP
85046A/B.
The
HP
85044A/B
transmission/reection
test
set
con
tains
a
p o
w
er
splitter
to
div
ert
a
p ortion
of
the
inciden
t
signal
to
the
R
input
of
the
analyzer.
The
remainder
of
the
inciden
t
signal
is
routed
through
a
directional
bridge
to
the
measuremen
t
p ort.
The
test
set
includes
a
man
ually
con
trolled
70
dB
step
attenuator,
and
a
bias
tee
for
external
biasing
of
active
devices
connected
to
the
test
p ort.
A
simplied
blo
c
k
diagram
of
the
HP
85044A/B
is
sho
wn
in
Figure
12-9c.
An
HP
11850C/D
or
11667A
p o
w
er
splitter
can
b e
used
instead
of
a
test
set
for
transmission
measuremen
ts
only
.
12-18
Theory
of
Operation
DRAFT
3/21/106
15:14
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