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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. RF Circuit Technical Brief
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2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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[Figure 4.2.5-1] KM555 Front End Control (FEM input)
[Figure 4.2.5-2] KM555 Front End Control (Control signal from Baseband IC)
2V85_VRF
1800
FB504
BLM15BD182SN1D
BLM15BD182SN1D
FB505
1800
0.1u
C538
U502
NL27WZ32USG
5
4
6
3
7
2
8
1
A1
VCC
B1
Y1
Y2
B2
GND
A2
1u
C542
FB506
1800
BLM15BD182SN1D
BLM15BD182SN1D
FB503
1800
2V85_VRF
TJ
12
1-
50
01
M1
-
B
H
02
1
FB502
1n
C537
FL500
D5017
6
5
4
3
7
11
9
22
21
20
13
24
12
23
10
15
8
14
1
17
16
2
19
18
PCS_RX1
PCS_RX2
ANT
PCN_RX1
PCN_RX2
GND1
EGSM_RX1
GND2
EGSM_RX2
GND3
GND4
GSM850_RX1
GND5
GSM850_RX2
WCDMA_2100
WCDMA_850
WCDMA_1900
PCN_PCS_TX
GSM850_EGSM_TX
D
D
V
1L
RT
C
2L
RT
C
3L
RT
C
4L
RT
C
ANT_SEL6
ANT_SEL5
ANT_SEL4
ANT_SEL1
ANT_SEL2
ANT_SEL3
(120ohm)
AC1
W8
AB4
AB3
V8
W9
AA8
V9
AB7
Y8
T_OUT0
T_OUT1
T_OUT2
T_OUT3
T_OUT4
T_OUT5
T_OUT6
T_OUT7
T_OUT8
HOOK_DETECT
JACK_DETECT
TXON_PA
ANT_SEL1
PA_MODE
ANT_SEL2
ANT_SEL3
_CHG_EOC
A8
A9
B10
A10
A11
B12
GPIO13
GPIO14
GPIO15
GPIO16
GPIO17
GPIO18
GPIO19
ANT_SEL6
ANT_SEL5
ANT_SEL4
3G_PA_MODE1