STW81103 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STW81103' PDF : 53 Pages View PDF
STW81103
Application information
For differential to single conversion, the 50 to 100Ω Johanson balun (1600BL15B100) is
recommended.
8.3
Divided by 4 output
The topology, components, values and considerations of Figure 31 also apply to the divided
by 4 output (MATCH_LC_LUMP_1G_DIFF.dsn).
As for the previous sections, a solution to combine the differential outputs is the lumped LC
type balun tuned in the 1 GHz band (Figure 34).
Figure 34. LC lumped balun for divided by 4 output (MATCH_LC_LUMP_1G.dsn)
Vcc
25 ohm
RFOUTP
RFOUTN
25 ohm
5.5nH
4pF
5.5nH
4pF
6pF
5.5nH
14nH
4pF
5.5nH
4pF
50 ohm
Vcc
If you prefer to use an RF balun, you can adapt the topology depicted in Figure 33, and
change the balun and the matching components (Figure 35). The suggested balun for the
0.625 - 1.25 GHz frequency range is the 1:1 Johanson 900BL15C050.
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