AN644 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – QuickChip Design Example 2 Low Power Silicon BJT LNA for 1.9GHz

AN644
Si477X LAYOUT GUIDELINES
1. Si477x QFN 6x6 mm Schematic and Layout
This section describes the application schematic and layout required for optimal Si477x performance.
1.1. Front-End Schematic
C6
10UF
37.20
L3
150NH
L2
47NH
C9
62PF
RF
RF
C25
NP
RF
C10
18PF
J1
FM ANT
L9
10NH
C11
NP
RF
SMA_EDGE
RF
ESD_DIODE
C24
D1
NP
RF
RF
C22
NP
RF
T1
1 RF
1:1
6
2
3
4
1NF
C8
C7
L1
2.2NF
220NH
RF
1
NC
2
FMXIP
3
FMXIN
4
GNDRF
RF
5
RFREG
6
FMO
7
FMI
8
NC
9
NC
10 _AMI
C26
NP
J29
RF
J33
AM ANT
SMA_EDGE
RF
D2
R1
0R
ESD_DIODE
C27
NP
RF
RF
JP1
AIRLOOP ANT
J36
NP
5
1
GND
RF
0R J35
R5
4
3
T2
0
SILABS
SL755TF01
J37
D3 ESD_DIODE
C23
NP
NP
RF
RF
R4
C13
0
0.1UF
Figure 1. Si477x FM/AM Front-End Schematic
Rev. 0.3 8/13
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AN644