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STW81102 bảng dữ liệu(PDF) 36 Page - STMicroelectronics

tên linh kiện STW81102
Giải thích chi tiết về linh kiện  Multi-band RF frequency synthesizer with integrated VCOs
PDF  43 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STW81102 bảng dữ liệu(HTML) 36 Page - STMicroelectronics

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Application information
STW81102
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Alternatively it is possible to combine the 2 outputs in different ways. A first topology for the
direct output (3GHz to 4.65GHz) is suggested in Figure 29. It basically consists of a simple
LC balun and a matching network to adapt the output to a 50
Ω load. The two LC networks
shift output signal phase of -90° and +90° thus combining the 2 outputs. This topology,
designed for a center frequency of 4GHz, is intrinsically narrow band, since the LC balun is
tuned at a single frequency. If the application requires a different sub-band, the LC combiner
could be easily adjusted to be tuned at the frequency of interest.
Figure 29.
LC lumped balun and matching network (MATCH_LC_LUMP_4G.dsn)
The 1.9nH shunt inductor works as a DC feed for one of the open collector terminal as well
as a matching element along with the other components. The 1.9nH series inductors are
used to resonate the parasitic capacitance of the chip.
For an optimum output matching it is recommended to use 0402 Murata or AVX capacitors
and 0403 or 0604 HQ Coilcraft inductors. It is also advisable to use short interconnection
paths to minimize losses and undesired impedance shift.
An alternative topology, which allows for a more broadband matching and balanced to
unbalanced conversion, is shown it Figure 30.
Figure 30.
Evaluation Board (EVB4G) matching network (MATCH_EVB4G.dsn)
For the differential to single conversion the 50 to 100
Ω Johanson balun is recommended
(3700BL15B100).
RFOUTP
RFOUTN
VCC
1.9nH
1.9nH
0.8pF
0.8pF
2.5pF
50 Ohm
VCC
1.9nH
1.9nH
0.8pF
0.8pF
50 Ohm
50 Ohm
RFOUTP
RFOUTN
VCC
1.9nH
1.9nH
0.8pF
0.8pF
2.5pF
50 Ohm
VCC
1.9nH
1.9nH
0.8pF
0.8pF
50 Ohm
50 Ohm
RFOUTP
RFOUTN
VCC
5.5nH
50 Ohm
12pF
12pF
5.5nH
12pF
2:1
VCC
50 Ohm
50 Ohm
1pF
1pF
4.7pF
1.2pF
1.2pF
RFOUTP
RFOUTN
VCC
5.5nH
50 Ohm
12pF
12pF
5.5nH
12pF
2:1
VCC
50 Ohm
50 Ohm
1pF
1pF
4.7pF
1.2pF
1.2pF



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