STW81102 datasheet(38/43 Pages) STMICROELECTRONICS

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Application information

STW81102

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Figure 33.

Evaluation Board (EVB2G) matching network (MATCH_EVB2G.dsn)

For the differential to single conversion the 50 to 100

Ω Johanson balun (1600BL15B100) is

recommended.

7.3

Divided by 4 Output

The same topology, components values and considerations of Figure 31, applies also for 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 1GHz band (Figure 34).

Figure 34.

LC lumped balun for the divided by 4 output (MATCH_LC_LUMP_1G.dsn)

If the user prefers to use an RF balun it is possible to adopt the same topology depicted in

Figure 33, just changing the balun and the matching components (Figure 35). The

suggested balun for the 0.75 - 1.17GHz frequency range is the 1:1 Johanson

900BL15C050.

RFOUTP

RFOUTN

VCC

5.5nH

50 Ohm

22pF

5.5nH

22pF

2:1

VCC

50 Ohm

1.2pF

1.9nH

RFOUTP

RFOUTN

VCC

5.5nH

50 Ohm

22pF

5.5nH

22pF

2:1

VCC

50 Ohm

1.2pF

1.9nH

RFOUTP

RFOUTN

VCC

5.5nH

4pF

6pF

50 Ohm

14nH

VCC

5.5nH

4pF

25 Ohm

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