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Mount Balun. 3W525 Datasheet

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Mount Balun. 3W525 Datasheet
















3W525 Balun. Datasheet pdf. Equivalent













Part

3W525

Description

Surface Mount Balun



Feature


3W525 Surface Mount Balun VER9/22/00 Fe atures: • • • • • • • • • • • 1.8 – 2.5 GHz 180° Tran sformer 50 Ohm to 25 Ohm Broad Band Low Insertion Loss High Power Even Order H armonic Suppression Input to Output DC Isolation Surface Mountable Tape & Reel Convenient Package Description: The 3 W525 is a low profile balanced to unbal anced transformer designed for push-pull am.
Manufacture

Xinger

Datasheet
Download 3W525 Datasheet


Xinger 3W525

3W525; plifiers in an easy to use surface mount package for PCS, DCS, . These compact Xinger® surface mount baluns are ideal for high volume manufacturing and are more reliable and repeatable than tradi tional baluns. The 3W525 has an unbalan ced port impedance of 50Ω and balance d port impedances of 25Ω to ground wi th a 50Ω balance between outputs. Thi s eases the matching of t.


Xinger 3W525

he push-pull amplifier’s power transis tors, which have low impedance levels. The output ports have equal amplitude ( -3dB) with 180 degree phase differentia l. The Xinger® balun is a res ult of y ears of research and development culmin ating with a solution so unique, a pate nt is pending on the design approach. T he 3W525 is available on tape and reel for pick and place hi.


Xinger 3W525

gh volume manufacturing. www.DataSheet4 U.com 3W525 MECHANICAL OUTLINE: ELEC TRICAL SPECIFICATIONS: 3W525 - Surface Mount Balun Parameter Operating Freque ncy Unbalanced Port Impedance Balanced Port Impedance (2ó3) Unbalanced Port R eturn Loss Insertion Loss (max) Output Amplitude Balance (p-p) Phase Balance P ower Rating (max) ΘJC Specification 1. 8-2.5 GHz 50Ω 50Ω (2.





Part

3W525

Description

Surface Mount Balun



Feature


3W525 Surface Mount Balun VER9/22/00 Fe atures: • • • • • • • • • • • 1.8 – 2.5 GHz 180° Tran sformer 50 Ohm to 25 Ohm Broad Band Low Insertion Loss High Power Even Order H armonic Suppression Input to Output DC Isolation Surface Mountable Tape & Reel Convenient Package Description: The 3 W525 is a low profile balanced to unbal anced transformer designed for push-pull am.
Manufacture

Xinger

Datasheet
Download 3W525 Datasheet




 3W525
3W525
Surface Mount Balun
VER9/22/00
3W525www.DataSheet4U.com
Features:
Description:
1.8 – 2.5 GHz
180° Transformer
50 Ohm to 25 Ohm
Broad Band
Low Insertion Loss
High Power
Even Order Harmonic
Suppression
Input to Output
DC Isolation
Surface Mountable
Tape & Reel
Convenient Package
The 3W525 is a low profile balanced to unbalanced transformer
designed for push-pull amplifiers in an easy to use surface
mount package for PCS, DCS, . These compact Xinger® surface
mount baluns are ideal for high volume manufacturing and are
more reliable and repeatable than traditional baluns. The
3W525 has an unbalanced port impedance of 50and
balanced port impedances of 25to ground with a 50balance
between outputs. This eases the matching of the push-pull
amplifier’s power transistors, which have low impedance levels.
The output ports have equal amplitude (-3dB) with 180 degree
phase differential. The Xinger® balun is a res ult of years of
research and development culminating with a solution so
unique, a patent is pending on the design approach. The 3W525
is available on tape and reel for pick and place high volume
manufacturing.
MECHANICAL OUTLINE:
ELECTRICAL SPECIFICATIONS:
3W525 - Surface Mount Balun
Parameter
Specification
Operating Frequency
1.8-2.5 GHz
Unbalanced Port Impedance
Balanced Port Impedance (2ó3)
50
50(25to Ground)
Unbalanced Port Return Loss
-15dB
Insertion Loss (max)
0.30 dB
Output Amplitude Balance (p-p)
0.40 dB
Phase Balance
180 + 5 degrees
Power Rating (max)
ΘJC
150 Watts CW
11.3 oC/Watt
Specifications based on performance of units installed in an RF microstrip test fixture. 50 ohms nominal input impedance, and 25 ohm nominal
output impedance. Temperature of operation, -55oC to +85oC. Unit will operate to +125oC with minor degradation in Insertion Loss performance.
Specifications subject to change without notice.
Page 1 of 3
Available on Tape and
Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
(315) 432-8909
(801) 544-2414




 3W525
TYPICAL PERFORMANCE: (@ 25oC on test board)
Amplitude Balance 3W525
0.4
0
3W525
Data Sheet VER9/22/00
Unbalanced Port Return Loss 3W525
-5
0.2
-10
0.0
-15
-0.2
-20
-0.4
1800
1975
2150
Frequency [MHz]
www.DataSheet4U.com
0.0
Insertion Loss 3W525
2325
2500
-25
1800
185
1975
2150
Frequency [MHz]
2325
Phase Balance 3W525
2500
183
-0.1
181
-0.2
179
-0.3
177
-0.4
1800
1975
2150
Frequency [MHz]
2325
2500
175
1800
1975
2150
Frequency [MHz]
2325
2500
PERFORMANCE DATA:
Due to the fact the output impedances of the balun are 25
to ground, a circuit board was produced to transform the
output impedances back to 50in order to test the phase
and amplitude balance of the balun (see plots above). The
test fixture is shown below. This wideband transformer has a
Chebychev characteristic response.
The unbalanced port return loss plot was measured at the
input of the aforementioned test board. Unbalanced port
return loss performance can be improved as narrow band
matching is performed at the output of the balun (input of
the transistor).
The insertion loss measurement was taken by connecting
two baluns back to back and a true insertion loss
measurement was collected, the fixture is shown below.
The insertion loss
was calculated by
taking
the
transmission loss of
the board assembly
and factoring out
reflected loss and,
since there are two
baluns on the test
board, that result
Page 2 of 3
Available on Tape and
Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
(315) 432-8909
(800) 544-2414




 3W525
3W525
Data Sheet VER9/22/00
was then halved.
One very important point worth noting: it is strongly
recommended, when implementing the surface mount balun,
that pin 1 of the first balun is offset from pin 1 of the opposing
balun, note the above test board with two mounted baluns.
This insures proper phase relationships for the combining of
signals. This convention must be followed if multiple push-
pull networks are combined. Otherwise, the signals would
cancel at the output port.
balance, insertion loss and VSWR may not meet published
specifications.
Overall ground is improved if a dense population of plated
through holes connect the top and bottom ground layers of
the PCB (Printed Circuit Board). This minimizes ground
inductance and improves ground continuity. All of the
Xinger components are constructed from ceramic filled
PTFE composites which possess excellent electrical and
mechanical stability having X and Y thermal coefficient of
expansion (CTE) of 17 ppm/oC
PIN CONFIGURATION
When a surface mount balun is mounted to a printed circuit
board, the primary concerns are; insuring the RF pads of
the device are in contact with the circuit traces of the PCB
and insuring the ground plane of neither the component nor
the PCB is in contact with the RF signal. As long as the
λ geometry of the unit fits onto the layout of the circuit trace
www.DataSheet4U.com
on the PCB, and the conditions of the previous paragraph
are followed, the balun’s performance is ensured. An
example of how the PCB footprint could look is shown
below. In specific designs, the transmission line widths
need to be adjusted to the unique dielectric coefficients
and thicknesses as well as varying pick and place
λ equipment tolerances.
Surface Mount Balun Layout
The internal configuration of the Xinger® balun is diagramed
above, the unbalanced port is DC connected to ground and
the two balanced ports have DC continuity with each other.
The DC isolation between the balanced ports and the
unbalanced port has some advantages, such as added
transistor protection from any DC surges (e.g. lightning)
which may be applied to the unbalanced port. Also, there is
an opportunity to share DC biasing of the transistors at the
balanced ports (dependent upon transistor repeatability),
improving overall reliability. The construction is bonded
multilayered stripline made of low loss dielectric with plated
through vias connecting the internal circuitry to the external
printed circuit board, similar to that of the Xinger® hybrids
and directional couplers.
MOUNTING
In order for Xinger surface mount components to work
optimally, there must be a 50transmission line to the
balanced port and 25transmission lines from the
unbalanced ports. Also, there must be a very good ground
plane under the balun to insure proper electrical performance.
If either of these two conditions are not satisfied, amplitude
Suggested Board Layout
Page 3 of 3
Available on Tape and
Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
(315) 432-8909
(800) 544-2414




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