XE1205
8
APPLICATION INFORMATION
This section provides details of the recommended component values for the frequency dependant blocks of the XE1205.
Note that these values are dependent upon circuit layout and PCB structure, and that decoupling components have been
omitted for clarity.
8.1
MATCHING NETWORK OF THE RECEIVER
The schematic of the matching network at the input of the receiver is given below (for a source impedance of 50 Ω ).
CR1
SOURCE
LR1
RFA
XE1205
RFB
CR2
VSS
Figure 25 Matching network at the input of the receiver.
The typical component values of the matching circuit are shown in Table 29 below.
Name
CR1
CR2
LR1
Typical Value for
434 MHz
1.5pF
1.5pF
100nH
Typical Value for
869 MHz
1.2pF
1.5pF
27nH
Typical Value for
915 MHz
1.2pF
1.2pF
27nH
Tolerance
± 5%
± 5%
± 5%
Table 29: Matching network values
8.2
MATCHING NETWORK OF THE TRANSMITTER
The optimum load impedances for 15 dBm output power at the three main frequencies are given in Table 30.
PA optimum load
0 dBm
5 dBm
10 dBm
15 dBm
434 MHz
174 + j17
117 + j22
111 + j17
89 - j19
869 MHz
120 + j80
115 + j79
95 + j49
80 + j17
915 MHz
103 + j94
101 + j77
95 + j49
84 + j11
Table 30: Optimum load impedances for 15dBm output power
? Semtech 2008
41
www.semtech.com
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