HP 8753D - Page 141

16.
To
set the
frequency oset
mode LO
frequency,
press:
4
SYSTEM
5
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INSTRUMENT MODE
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FREQ OFFS
MENU
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LO
MENU
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FREQUENCY:CW
4
1500
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4
M/

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17.
T
o
select
the
converter
type
and
low-side
LO
measurement
conguration,
press:
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RETURN
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DOWN
CONVERTER
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RF>LO
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FREQ
OFFS ON
In
this
low-side
LO
,
down converter
measurement, the
analyzer's source
frequency
range
will
be
oset
higher
than
the receiver
frequency range
. The
source
frequency
range
can
be
determined
from
the
following
equation:
receiver
frequency range
(100 {
1000 MHz)
+LO
frequency
(1500
MHz)
=
1.6-2.5
GHz
18.
To
view the
conversion loss
in the
best
vertical
resolution,
press:
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VIEW
MEASURE
4
SCALE
REF
5
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AUTOSCALE
Figure 3-13
shows
the
conversion
loss
of
this
low-side
LO
,
mixer
with
output
ltering.
Notice
that
the
dynamic
range
from
the
pass
band
to
the
noise
oor
is well
above the
dynamic
range
limit
of
the
R
Channel.
If
the
mixer
under
test
also
contained amplication,
then
this
dynamic
range
would
have
been
even
greater
due
to
the
conversion
gain
of
the
mixer
.
Figure 3-13. Example of Swept IF Conversion Loss Measurement
3-16 Making Mixer Measurements