AV-LZ SERIES
FLEXIBLE MICROSTRIP
TRANSMISSION LINES
FOR LASER DIODE DRIVERS
In many high-current laser diode testing applications, it is
(approximately 1 cm × line width) with accessible output
not possible to use a 50 Ohm termination - typically the
and ground solder pad areas. The ground conductor and
load is closer to 1 to 12 Ohms. For these applications,
signal conductor on the other end of the line are exposed
Avtech offers the unique AV-LZ and AV-CLZ series of
for convenient solder connection. Scissors or a sharp knife
transmission lines that have characteristic impedances (Z0)
may be used to cut the line to shorter lengths as required.
in this range. When a transmission line with a
The input end of the line can be left unterminated (i.e., the
characteristic impedance of Z0 is used to drive a load
line is snipped with scissors, and the film is peeled back
impedance of RL, and Z0 = RL, ideal matching will occur.
slightly to provide soldering access to the copper foils).
Under these conditions, longer-than-normal cable lengths
Alternatively, the input end can be supplied terminated with
can be used without introducing significant ringing, speed
a male DB-37 connector, suitable for mating to a variety of
degradation, or other distortions.
Avtech pulsers (check the pulser datasheet to confirm that
The newer AV-CLZ transmission lines are described in
it has a DB-37 female output connector.) Pins 1-19 of each
detail at http://www.domain.avtechpulse.com/transmission.
connector are connected to the signal line, and pins 20-37
These highly-rugged lines are recommended for most
are connected to the ground line.
applications. However, for applications requiring a lighter,
Avtech can provide other connector arrangements, suitable
more flexible cable, the older AV-LZ series is still available.
for use with older equipment and other instruments.
AV-LZ transmission lines consist of a sandwich structure of
Contact the factory (info@avtechpulse.com) with your
three layers of polyimide Kapton film and two layers of
special requirement.
copper foil, which results in a highly flexible flat
The AV-LZ is suitable for laboratory use, but is not
transmission line with low characteristic impedance.
recommended for production test environments due to its
Connection to the output end of the line is normally via
relatively fragile nature compared to the more rugged AV-
soldering, and the lines are normally supplied with one end
CLZ series.
soldered to a smal piece of 1/16" glass epoxy circuit board
Model:
AV-LZ1
AV-LZ2
AV-LZ3
AV-LZ6
AV-LZ10
AV-LZ12
Characteristic impedance (Z0, ±20%):
1 Ω
2 Ω
3 Ω
6 Ω
10 Ω
12 Ω
Maximum pulse current:
100 A
50 A
30 A
15 A
10 A
8A
Series resistance:
(signal and ground lines)
0.05 Ω / m
0.1 Ω / m
0.15 Ω / m
0.3 Ω / m
0.5 Ω / m
0.6 Ω / m
Rise time:
< 5 ns
Maximum width:
25.4 mm (1”)
13 mm (0.52”)
Output end termination:
25.4 × 10 mm circuit board,
13 × 10 mm circuit board,
suitable for soldering
suitable for soldering
Input end termination:
Standard: none. Optional1: DB-37 male. Pins 1-19 = signal, pins 20-37 = ground.
Length:
1 meter standard, 2 meters optional2
Temperature range:
+5°C to +40°C3
Bend radius:
1 cm
1) Add the suffix -DB37M to specify the male DB-37 input termination.
nitrogen temperatures, but Avtech does not recommend the LZ series for
2) Add the suffix -2M to specify 2 meter length.
use at these temperatures. Damage at low temperatures is not covered by
3) Some users have reported successful use of the LZ series at liquid
the warranty. Usage at cryogenic temperatures is "at your own risk".
LZ CABLE
OUT
GROUND
PAD
PAD
Layout of output end termination
Photo of output end termination
printed circuit board
printed circuit board
See http://www.avtechpulse.com/appnote/techbrief10 for AV-LZ application information!