HP 8753D Option 011 User Manual

5.
The dierence
frequency (1st
IF) from
the A4
sampler is
compared to
a
reference.
The
1st
IF feedbac
k signal
from
the
A4
is
ltered
and
applied
to
a
phase
comparator
circuit in
the
A11
phase
lo
c
k
assem
bly.
The other
input to
the phase
comparator is
a crystal
controlled
1
MHz
signal from
the A12
reference assem
bly.
Any
frequency
dierence
b
et
w
een
these
t
w
o
signals pro
duces
a
prop
ortional
error
v
oltage.
6.
A
tuning
signal
(YO
DRIVE)
tunes
the
source and
phase lo
ck
is ac
hiev
ed.
The
error
v
oltage is
used to
drive
the
A3
source
YIG
oscillator,
in
order
to
bring
it
closer
to
the
required
frequency
.
The
lo
op
pro
cess
con
tin
ues
un
til
the
1st
IF feedbac
k signal
to the
phase
comparator
is
equal
to
the
1
MHz reference
signal, and
phase lo
ck
is
ac
hiev
ed.
7.
A
syn
thesized
subsw
eep
is
generated
b
y
A13/A14.
The
A3
source
trac
ks
the
syn
thesizer.
When
the
source
is
phase
lo
c
k
ed
to the
synthesizer
at the
start frequency
,
the
syn
thesizer
starts
to
sweep.
The phase
lo c
k
ed
lo
op
forces
the
source
to
trac
k
the
syn
thesizer,
main
taining
a
constan
t
1
MHz
1st
IF
signal
.
The
full
high
band
sw
eep
is
generated
in
a
series
of
subsw
eeps,
b
y
phase
lo c
king the
A3
source
signal
to
harmonic
m
ultiples
of
the
fractional-N
V
CO. The
16 to
31
MHz
subsw
eep
is
pro
duced
b
y
a
one half
harmonic,
using
the
divide-b
y-2
circuit
on
the
A14
assem
bly
.
A
t
the transitions
bet
w
een
subsw
eeps,
the
source
is
pretuned
and
then
relo
c
ks.
T
able
12-3
lists
the
high
band
subsw
eep
frequencies from
the fractional-N
VCO
and
the
RF
output.
Figure
HBBLK12
here.
Figure 12-5. High Band Operation of the Source
12-14 Theory of Operation DRAFT
3/21/106 15:14
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HP 8753D Option 011 Specifications

General

Brand	HP
Model	8753D Option 011
Category	Measuring Instruments
Language	English