Agilent Technologies 4395A - Page 314

Evaluation
of
a
Varactor
Diode -
DC Bias
Sweep Using
List Sweep
Function (ZA
Mode)
Evaluation of
aV
aractor Diode
-DC
Bias Sweep
Using List
Sweep
Function (ZA
Mode)
This
section provides
an example
application of
impedance analyzer
mode in
which
the
4395A
's
internal
DC source
(Option 001)
is controlled
through
the
list
sweep
function
to
evaluate
the
characteristics
of a
varactor diode
under DC
bias
conditions
.
Measurement
Setup
Connection
Connect
the
4395A
with
the
43961A
Impedance
T
est
Kit
in
the
same
procedure
as described
in
\Evaluation
of
a
Chip
Capacitor
(ZA
Mode)".
Connect
the
BNC(m)-BNC(m)
cable
included
in
the
43961A
package
between
the
4395A
's
DC
SOURCE
connector
and
the 43961A's
DC
SOURCE
Input
connector
.
Analyzer
Settings
Press
4
Preset
5
.
Then
set
the
4395A
's
controls
as
follows:
Desired
Settings
K
ey
Strokes
MEASUREMENT
block
Select
impedance
analyzer
mode
4
Meas
5
F
FF
FF
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
FF
FF
FF
FF
F
F
F
F
ANALYZER
TYPE
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
FF
FF
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
IMPEDANCE
ANALYZER
A
CTIVE
CHANNEL
block
Select
channel
1
4
Chan
1
5
(default)
MEASUREMENT
block
C
p
(parallel
capacitance)
4
Meas
5
F
F
F
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
F
F
MORE
1/5
F
F
F
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
F
F
MORE
2/5
F
F
F
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
F
F
MORE
3/5
F
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
CAPACITANCE:
PRL(C
p
)
A
veraging
factor
8
4
Bw/A
vg
5
F
F
F
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
FF
F
F
F
F
F
F
AVERAGING
FACTOR
4
8
5
4
2
1
5
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
AVERAGING
on
OFF
(to
F
F
F
F
F
FF
F
F
F
F
F
F
F
F
F
ON
off
)
SWEEP
block
Hold
trigger
4
Trigger
5
F
F
F
F
F
FF
FF
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
SWEEP:
HOLD
Dening
the
Sweep
List
The
list
sweep
function
controls the
sweep process
in accordance
with
a
user-dened
sweep
list.
T
o
dene
the sweep
list, follow
these steps:
1. Press
4
Source
5 and
check that
DC source
output is
turned
o.
(Softkey
label
must
be
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
NN
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
DC
OUT
on
OFF
).
2.
Check that
NNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNN
DC SRC [VOLTAGE]
(voltage mode) is currently selected.
3.
Choose
NNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
N
DC CURRENT LIMIT
and press
4
1
54
0
54
k/m
5 to set the upper limit current to 10
mA . (Note that you may need to specify a greater or smaller value depending on the
specications of the actual DUT).
4.
Press 4
Sweep
5 and choose
NNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNN
SWEEP TYPE MENU
NNNNNNNNNNNN
NNNNNNNNNNNNNNNNN
EDIT LIST
to begin editing
the sweep list.
First, you dene segment 1 of the sweep list.
5.
Choose
N
NNNNNNNNNN
ADD
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SEGMENT: START and press 4
3
54
0
54
0
54
M/ 
5 . This denes both start and stop
frequency for segment 1 to be 300 MHz, and instructs the 4395A to keep the frequency for
segment 1 constant at 300 MHz.
6. Do not change the number of points. (default value is 2)
10-36 Examples of Applications