Front End Module Control; Power Amplifier Module - LG KE970 Service Manual

3. TECHNICAL BRIEF

3.24. Front End Module control

Implemented in the Transceiver are two outputs for direct control of front end modules with two logic
input pins to select RX- and TX-mode as well as low- and high band operation.
L406 3.3nH
G3 ANT
4
C406
G2
3
NA
G1
2
WFL-R-SMT10
CN401

3.25. Power Amplifier Module

C408
100p
C409 C410
0.5p NA
R407
0
C411 C412
NA NA
C405
22p LSHS-M085FE
R404
G2
ANT
ANT RF
G1 17
0
SW401 L401
C407
KMS-512 100nH
1.2p
Figure 37 FEM schematic
GND25
27
GND24
28
GND23
29
GND22
30
GND21
31
GND20
32
GND19
33
GND18
34
GND17
U402
35
GND16
SKY77340
36
GSM_OUT
9
GND5
10
GND4
11
RSVD2
12
GND3
13
GND2
14
GND1 DCS_PCS_IN
15
DCS_PCS_OUT
16
Figure 38 PAM schematic
2V85_RF
C401
1000p
R401
100ohm
R402
100ohm
C402 C403
100p 100p
10p
C404
FL401
GND15
26
GND14
25
GND13
24
GND12
23
GND11
22
GND10
VSUPPLY
21
GND9
20
GND8
19
GND7
18
GND6
17
EN
8
GSM_IN
7
VRAMP
6
VBATT
5
RSVD1
4
BS
3
2
MODE
1
C426 C427 C413 C428 C429 C430
68u
0.1u 1u 27p 100p 100p
- 64 -
U401
NC7WV16P6X
Y1 A1 ANT_SW1
VCC GND
Y2 A2 ANT_SW2
TXON_PA
LBAND_PAM_IN
PA_LEVEL
R405 1.2K
R406 0
VBIAS
PA_BAND
HBAND_PAM_IN
MODE
C414 C431 C415
100p 820p 100p