3. TECHNICAL BRIEF
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Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
TX Module Mode
Tx ENABLE
GpCtrl1
GpCtrl0
Off
0
0
0
RX 0
0
1
0
RX 1
0
1
1
GSM850/900 TX Mode
1
1
0
DCS1800/PCS1900 TX Mode
1
1
1
Figure 3.3.2 RF-module CIRCUIT DIAGRAM
C463
DNI
DNI
C464
C465
DNI
C410
22u
C461
100p
U400
12
18
19
20
21
22
13
6
14
2
15
5
16
4
17
3
11
1
10
9
8
7
23
GND_SLUG
VRAMP
TX_ENABL
E
GPCTRL0
GPCTRL1
GND1
VBAT
T
GND2
RX
1
RFIN_LB
NC2
GND3
ANTENNA
RFIN_HB
GND6
GND4
GND5
GND9
GND8
GND7
NC3
RX
0
NC1
C408
0.1u
C409
22p
C451
DNI
DNI
C452
C462
100p
VBAT
220p
C407
R409
24K
10K
R407
RF_TX_RAMP
LowBand_Tx
HighBand_Tx
RF_PA_EN
RF_ANT_SW1
RF_ANT_SW2
Changed (9/10)
Changed (7/27)
Changed (11/6)
(7/16) U400 : RF7180 -> RF7182
(50ohm)
(50ohm)
(10V, X5R)
(50V)
close to TXM
Shielding by GND
(7/3) DC Blocking