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STW81102 데이터시트(PDF) 35 Page - STMicroelectronics

부품명 STW81102
상세설명  Multi-band RF frequency synthesizer with integrated VCOs
PDF  43 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STW81102 데이터시트(HTML) 35 Page - STMicroelectronics

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STW81102
Application information
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7
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
100 Ohm
50 Ohm
RFOUTP
RFOUTN
VCC
5.5nH
50 Ohm
10pF
5.5nH
10pF
VCC
100 Ohm
100 Ohm
50 Ohm



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