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3. TECHNICAL BRIEF
Mode
STANDBY
RX1
RX2
RX3
RX4
LB_TX
HB_TX
1. X = DON'T CARE
2. RX1, RX2, RX3, and RX4 are broadband receive ports and each supports the GSM850, GSM900, DCS, and PCS bands.
VLOGIC
R401
1K
TX_RAMP
TX_EN
BS1
BS2
C400
1n
Register delete
EGSM
LGE Internal Use Only
VLOGIC
TX_EN
0
1
1
1
1
1
1
Figure 3.3.2 Band SW Logic Table
C401
C402
C403
C404
1n
1n
39p
1n
33
PGND3
32
PGND2
31
PGND1
10
GND5
11
RX1
12
RX2
13
RX3
14
RX4
15
GND6
16
GSM850
GND7
PCS1900
36
PGND6
DCS1800
35
PGND5
34
PGND4
Figure 3.3.3 FEM CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
Input Control Bits
BS1
X
X
0
0
0
0
0
1
0
1
1
0
1
1
VBAT
1
GND1
30
L400
VBATT
SKY77547
29
DCS_PCS_IN
U400
28
C455
GND17
27
GSM_IN
26
GND16
25
GND15
- 4 -
Copyright © 2011 LG Electronics. Inc. All right reserved.
BS2
X
0
1
1
0
X
X
(10V,1608)
C408
C406
C407
4.7u
10n
33p
3.3n
L401
3.3n
100p
L404
1.5n
C420
1p
Only for training and service purposes
DCS_PCS_OUT
GSM_OUT
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