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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. Technical brief
A. Front End Part
SKY77519 TX-RX Front End Module (FEM) offers a complete transmit VCO-to-Antenna and
Antenna-to-receive SAW filter solution in a low profile (1.2 mm), compact form factor for
handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The FEM also supports
Class 12 General Packet Radio Service (GPRS) multi-slot operation, Polar EDGE modulation,
and provides single UMTS band (band 1 or band 2) antenna switch-through via a dedicated
UMTS port.
Figure 3-7-10. Front End part schematic
Figure 3-7-9. SKY77519 Functional Block Diagram
3n
L115
I
N
D
9
01C
1n
L103
p5.0
85
1
C
3
0
60
p2
2
4
1
1
C
5
1
1C
30
6
0
p22
9
1
1C
3
0
60
p
22
1
0
1WS
3
BR
00
6
2
-0
3
48
M
M
2
65
43
1
IN
GND1GND2
GND3GND4
OUT
2
0
1
W
S
01
T
M
S-
R
-
L
F
U
1
G
T
N
A2
G
5
01U
9
1
577Y
KS
9
2
5
1
6
1
4
1
7
1
3
1
8
1
2
19
1
1
1
0
2
92
2
4
2
0
1
71
2
6
5
3
2
4
5
2
3
2
62
1
72
882
TNA
1
SB
2S
B
NE
X
T
E
D
O
MT
TA
B
V
D
VSR
C
P
AV
4
XR
3XR
NI
_M
SG
2X
R
1
X
R
N
I_SC
P_
S
CD
1A
MD
C
W
31
DN
G
1
D
NG21
D
N
G
2
DN
G
1
1
DN
G
3
DNG01
D
N
G
4D
NG
9
D
NG
5
DN
G
8
DN
G
7
D
N
G
DNGP
6
DNG
2
4
1
C
u
0
1
u
0
1
0
4
1
C
0603
n
0
1
1
31
C
0603
p2
2
5
41
C
VBAT
0
0
9
X
R
00
9
1
X
R
0
08
1
X
R
1
_D
NAB_
FR
W
0
WS
T
NA
2
W
ST
NA
1WS
T
NA
S
C
PS
C
D_X
T
M
S
GE_
X
T
CPA
V
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