Only For Training And Service Purposes - LG GD580 Service Manual

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.
C 1 4 5 C 1 3 1 C 1 4 0
2 2 p 1 0 n 1 0 u
T X _ D C S P C S
T X _ E G S M
V A P C
A N T S W 2
A N T S W 1
A N T S W 0
C 1 1 9
2 2 p
0 6 0 3
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Figure 3-7-9. SKY77519 Functional Block Diagram
C 1 4 2
1 0 u
G N D 6
1 5
G N D 7
1 6
G N D 8
1 7
G N D 9
1 8
G N D 1 0
1 9
G N D 1 1
2 0
G N D 1 2
2 2
G N D 1 3
2 4
S K Y 7 7 5 1 9
D C S _ P C S _ N I
2 1
U 1 0 5
G S M _ N I
2 3
V A P C
2 5
V B A T T
2 6
B S 2
2 7
B S 1
2 8
C 1 1 4
C 1 1 5
2 2 p
2 2 p
0 6 0 3
0 6 0 3
Figure 3-7-10. Front End part schematic
P G N D
2 9
G N D 5
1 4
G N D 4
1 3
G N D 3
1 2
G N D 2
1 1
G N D 1
9
W R F _ B A N D _ 1
W C D M A 1
1 0
R X 1
7
R X 2 R X 9 0 0
6
R X 3 R X 1 9 0 0
5
R X 4 R X 1 8 0 0
4
S W 1 0 1
R S V D
M M 8 4 3 0 2 -
3
M O D E
2
T X E N
1
A N T
8
C 1 5 8
0 5 . p
- 77 -
3. Technical brief
6 0 0 R B 3
S W 1 0
U F L R -
A N T
C 1 0 9
D I N
LGE Internal Use Only
2
S - M T 1 0
G 1
G 2