STW81101AT datasheet(37/42 Pages) STMICROELECTRONICS

Part #	STW81101AT

Description	Multi-band RF frequency synthesizer with integrated VCOs

PDF	42 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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37 / 42 page

STW81101

Application information

37/42

Figure 29.

Lumped output matching for divided by 2 output

(MATCH_LC_BAL_2G.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 27, 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 30).

Figure 30.

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 29, just changing the balun and the resistor value (Figure 31). The suggested balun

for the 0.8 - 1.1GHz frequency range is the 1:1 Johanson 900BL15C050.

RFOUTP

RFOUTN

VCC

22nH

50 Ohm

10pF

22nH

10pF

2:1

VCC

50 Ohm

RFOUTP

RFOUTN

VCC

5.5nH

4pF

6pF

50 Ohm

14nH

VCC

5.5nH

4pF

25 Ohm

STW81101AT Datasheet(PDF) 37 Page - STMicroelectronics

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