STW81102 datasheet(37/43 Pages) STMICROELECTRONICS

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STW81102

Application information

37/43

7.2

Divided by 2 Output

If the user's application does not require a balanced to unbalanced conversion, the output

matching reduces to the simple circuit shown below (Figure 31).

This solution can be easily used to provide one single ended output just terminating the

other output at 50

Ω with a 3dB power loss.

Figure 31.

Differential/single ended output network in the 1.5 - 2.325GHz range

(MATCH_LC_LUMP_2G_DIFF.dsn)

A first solution to combine the differential outputs is the lumped LC type balun tuned in the

2GHz band (Figure 32).

Figure 32.

LC lumped balun for divided by 2 output (MATCH_LC_LUMP_2G.dsn)

The same recommendation for the SMD components applies also for the divided by 2

output.

Another topology suitable to combine the two outputs for the divided by 2 frequencies is

represented in Figure 33.

RFOUTP

RFOUTN

VCC

22nH

50 Ohm

10pF

22nH

10pF

VCC

50 Ohm

RFOUTP

RFOUTN

VCC

2.7nH

2pF

3pF

50 Ohm

3nH

VCC

2.7nH

2pF

50 Ohm

RFOUTP

RFOUTN

VCC

2.7nH

2pF

3pF

50 Ohm

3nH

VCC

2.7nH

2pF

50 Ohm

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