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XE1205
The schematic of the recommended matching network at the output of the transmitter is given in Figure 28 below. The
two Π -sections are used to provide harmonic filtering to satisfy FCC and ETSI regulations.
VDD
CT2
XE1205
OUTPUT
LT3
CT3
RFOUT
LT2
Figure 28 Matching network at the output of the transmitter.
The typical component values of the matching circuit are shown in Table 31 below.
Name
CT1
CT2
CT3
CT4
CT5
LT1
LT2
LT3
Typical Value
for 434 MHz
6.8 pF
1.0 pF
22 pF
6.8 pF
4.7 pF
33 nH
22 nH
22 nH
Typical Value
for 869 MHz
1.5 pF
0.56 pF
15 pF
3.3 pF
2.2 pF
39 nH
10 nH
8.2 nH
Typical Value
for 915 MHz
1.8 pF
NC
33 pF
3.3 pF
2.2 pF
47 nH
10 nH
8.2 nH
Tolerance
± 5%
± 5%
± 5%
± 5%
± 5%
± 5%
± 5%
± 5%
Table 31: Matching circuit component values
8.3
VCO TANK
The VCO tank circuit should implemented with an inductor and capacitor in parallel. Typical component values are
shown in Table 32.
Name
CV1
LV1
434 MHz
1.0 pF
33 nH
869 MHz
NC
6.8 nH
915 MHz
NC
5.6 nH
Tolerance
± 5%
± 2%
Table 32: VCO tank component values
? Semtech 2008
44
www.semtech.com
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