LG GW520 - Page 60

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. RF Circuit Technical Brief
GW520 service manual
[Figure 4.2.5-1] GW520 Front End Control (FEM input)
[Figure 4.2.5-2] GW520 Front End Control (Control signal from Baseband IC)
120
100pC547
FB503
R510
1K
C545 100p
C551
1u
UMTS2
21
22
UMTS3
VC1
3
VC2
4
VC3
5 6
VC4
7
VDD
GND1
1
10
GND2
8
GND3
23
GND4
24
GND5
GSM1800_1900TX
9
GSM1800_RX1
16
17
GSM1800_RX2
GSM1900_RX1
18
19
GSM1900_RX2
11
GSM850_900TX
GSM850_RX1
12
13
GSM850_RX2
14
GSM900_RX1
15
GSM900_RX2
UMTS1
20
LMSP43QL-771
SFAY0011901
FL500
ANT
2
2V85_VRF
R508
1K
C544 100p
C540
0.1u
2V85_VRF
1K
R511
1K
R509
B2
4
GND
8
VCC
Y1
7
Y2
3
EUSY0154001
NL27WZ32USG
U503
1
A1
A2
5
B1
2
6
100pC546
C539
1000p
ANT_SEL2
ANT_SEL6
ANT_SEL5
ANT_SEL1
ANT_SEL4
ANT_SEL3
AB7
V9
AA8
W9
V8
AB3
AB4
W8
AC1
SLIDE_KEY_LED
MMC_DETECT
ANT_SEL1
_CHG_EOC
ANT_SEL2
TOUCH_SDA
TXON
_
PA
PA_MODE
ANT_SEL3
GPIO[14]
B12
GPIO[15]
A11
A10
GPIO[16]
GPIO[17]
B10
A9
GPIO[18]
GPIO[19]
A8
3G_PA_MODE1
ANT_SEL6
ANT_SEL4
ANT_SEL5