HP 8753D Option 011 User Manual

The 2nd
LO
Signal
The
2nd LO
is obtained
from the
A12 reference
assem
bly
.
In
high
band,
the
2nd
LO
is
xed
at
996
kHz.
This
is
pro
duced
b
y
feeding
the
39.84 MHz
output of
a phase-lo
ck
ed oscillator
in
the A12
assembly
through a
divide-by-40
circuit.
In
low
band, the
2nd LO
is a
variable
frequency
pro
duced
b
y
mixing
the
output
of
the
fractional-N
V
CO
with
a
xed
39.996
MHz
signal
in
the
A12
assem
bly
.
The
2nd
LO co
vers
the
range
of
0.304
to
16.004
MHz
(0.014
to 16.004
MHz if
Option 011
is com
bined
with
Option
006) in
tw
o subsw
eeps
that
corresp
ond
with
the
source
subsw
eeps.
These
subsw
eeps
are
0.304
to
3.304
MHz
and
3.304
to
16.004
MHz.
The
Mixer Circuit
The 1st
IF and
the
2nd
LO
are
com
bined
in
the
mixer
circuit.
The
resulting
dierence
frequency
(the
2nd
IF)
is
a
constan
t
4
kHz
in
b
oth
bands,
as T
able 12-4
shows.
Table
12-4.
Mixer
Frequencies
Band 1st
IF
2nd
LO
2nd
IF
Sup
er
Lo
w*
0.010
to
0.300
MHz
0.014
to
0.304
MHz
4.0
kHz
Lo
w
0.300
to
16.0
MHz
0.304
to
16.004
MHz
4.0
kHz
High 1.000
MHz
0.996
MHz
4.0
kHz
*
This
band
is presen
t
on
the
HP
8753D
Option
011
only
when
it
is
com
bined
with
the
Option
006.
A10
Digital
IF
The
three
4
kHz
2nd
IF
signals
from
the
sampler/mixer
assem
blies
are
input
to
the
A10
digital
IF assem
bly.
These
signals
are
sampled
at
a
16
kHz
rate.
A
fourth
input
is
the
analog
bus,
whic
h
can
monitor
either
an
external
input at
the rear
panel
A
UX
IN
connector,
or
one
of
31
in
ternal
no
des.
A
m
ultiplexer
sequen
tially
directs
each
of the
signals to
the ADC
(analog-to-digital
conv
erter).
Here
they
are
con
v
erted
to
digital
form
and
sen
t
to
the
A9
CPU
assem
bly
for
pro
cessing. Refer
to \Digital
Control
Theory"
for
more
information
on
signal
pro
cessing.
DRAFT
3/21/106 15:14
Theory of Operation 12-21
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HP 8753D Option 011 Specifications

General

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