STW81101AT datasheet(36/42 Pages) STMICROELECTRONICS

부품명	STW81101AT

상세설명	Multi-band RF frequency synthesizer with integrated VCOs

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제조업체	STMICROELECTRONICS [STMicroelectronics]

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Application information

STW81101

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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 27).

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 27.

Differential/single ended output network in the 1.65 - 2.2GHz 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 28).

Figure 28.

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 29.

RFOUTP

RFOUTN

VCC

22nH

50 Ohm

10pF

22nH

10pF

VCC

50 Ohm

RFOUTP

RFOUTN

VCC

3nH

5.5nH

1pF

1nH

2.8pF

50 Ohm

2nH

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