STW81102 datasheet(35/43 Pages) STMICROELECTRONICS

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STW81102

Application information

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Application information

The STW81102 features three different alternatively selectable bands: direct output (3.0 to

3.62GHz and 4.0 to 4.65GHz), divided by 2 (1.5 to 1.81GHz and 2.0 to 2.325GHz) and

divided by 4 (750 to 905MHz and 1000 to 1162.5MHz). In order to achieve a suitable power

level, a good matching network is needed to adapt the output stage to a 50

Ω load.

Moreover, since most of commercial RF components have single ended input and output

terminations, a differential to single ended conversion could be required.

Below different matching configurations for the three bands are suggested as a guideline for

the design of own application board.

The user can find in the Evaluation Kit the ADS Design for each matching configuration

suggested in this section. The name of the corresponding ADS Design is reported in each

figure.

The ADS designs provide only a first indication of the output stage matching and they

should be reworked according to the user choice for layout, board substrate, components

and so on.

The ADS designs of the Evaluation Boards are provided with a complete electromagnetic

modelling (board, components, ...).

7.1

Direct Output

If a differential to single conversion is not needed it is possible to match the output buffer of

the STW81102 in the simple way shown in Figure 28.

Figure 28.

Differential/single ended output network in the 3.0 - 4.65GHz range

(MATCH_LC_LUMP_4G_DIFF.dsn)

Since most of discrete components for microwave applications are single ended, the user

can easily use one of the two outputs and terminate the other one to 50

Ω with a 3dB power

loss.

RFOUTP

RFOUTN

VCC

5.5nH

50 Ohm

10pF

5.5nH

10pF

VCC

100 Ohm

50 Ohm

RFOUTP

RFOUTN

VCC

5.5nH

50 Ohm

10pF

5.5nH

10pF

VCC

100 Ohm

50 Ohm

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