3A325 Datasheet, PDF (2/3 Pages) List of Unclassifed Manufacturers – Surface Mount Balun

TYPICAL PERFORMANCE: (@ 25^oC on test board)
Amplitude Balance 3A325
0.4
0
-5
0.2
-10
0.0
-15
-20
-0.2
-25
-0.4
470
0.0
570
670
770
Frequency [MHz]
Insertion Loss 3A325
-30
870
470
185
183
-0.1
181
-0.2
179
-0.3
177
3A325
Data Sheet VER9/22/00
Input Return Loss 3A325
570
670
770
870
Frequency [MHz]
Phase Balance 3A325
-0.4
175
470
570
670
770
Frequency [MHz]
870
470
570
670
770
Frequency [MHz]
870
PERFORMANCE DATA:
Due to the fact the output impedances of the balun are 25Ω
to ground, a circuit board was produced to transform the
output impedances back to 50Ω in 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 was then halved.
Page 2 of 3
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