LG KE600 Service Manual - Page 66

Front End Module control, 25. Power Amplifier Module

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3. TECHNICAL BRIEF 3.24. Front End Module control Implemented in the S-Gold2 (U101) are three outputs which are ANT_SW1, ANT_SW2 and ANT_SW3 for direct control of front end modules with three logic input pins to select RX and TX mode as well as low and high band operation. MODE VDD VCTRL1 VCTRL2 VCTRL3 Tx 1GHz ON ON OFF OFF Tx 2GHz ON ON ON OFF Rx EGSM ON OFF ON OFF Rx DCS ON OFF OFF ON TX PCS ON OFF OFF OFF 2V85_RF C605 C606 56p 0.1u 1 ANT VDD 3 VCTRL1 22 VCTRL2 21 VCTRL3 20 2 GND1 4 GND2 5 GND3 GND4 7 9 GND5 GND6 10 FL601 YGHF-S006T GND11 26 GND10 25 GND9 24 GND8 23 GND7 11 18 NC1 19 NC2 16 EGSM_RX17 EGSM_RX+ 14 15 DCS_RX12 DCS_RX+ 13 PCS_RX- PCS_RX+ 6 TX1G 8 TX2G Figure 40 FEM schematic R601 R602 R603 100ohm 100ohm 100ohm C601 C602 C603 39p 39p 39p ANT_SW1 ANT_SW2 ANT_SW3 3.25. Power Amplifier Module The RF3158 (U601) is a high-power, dual-mode amplifier (PA) with integrated power control. This PA is designed to operate both in a saturated mode for GMSK signaling and in a linear mode for 8PSK modulation. Featuring input and output terminals that are internally matched to 50 ohms, the PAM is designed to be the final amplification stage in a dual-mode GSM/EDGE mobile transmit lineup operating in the 824 MHz to 915 MHz (low) and 1710 MHz to 1910 MHz (high) bands. - 67 -

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3. TECHNICAL BRIEF
- 67 -
3.24. Front End Module control
Implemented in the S-Gold2 (U101) are three outputs which are ANT_SW1, ANT_SW2 and ANT_SW3
for direct control of front end modules with three logic input pins to select RX and TX mode as well as
low and high band operation.
3.25. Power Amplifier Module
The RF3158 (U601) is a high-power, dual-mode amplifier (PA) with integrated power control. This PA
is designed to operate both in a saturated mode for GMSK signaling and in a linear mode for 8PSK
modulation. Featuring input and output terminals that are internally matched to 50 ohms, the PAM is
designed to be the final amplification stage in a dual-mode GSM/EDGE mobile transmit lineup
operating in the 824 MHz to 915 MHz (low) and 1710 MHz to 1910 MHz (high) bands.
39p
C603
C602
39p
R601
100ohm
R603
100ohm
2V85_RF
56p
C605
VCTRL2
21
VCTRL3
20
VDD
3
C606
0.1u
26
GND11
GND2
4
5
GND3
GND4
7
9
GND5
GND6
10
GND7
11
23
GND8
24
GND9
18
NC1
NC2
19
13
PCS_RX+
PCS_RX-
12
6
TX1G
8
TX2G
22
VCTRL1
FL601
1
ANT
15
DCS_RX+
DCS_RX-
14
17
EGSM_RX+
EGSM_RX-
16
GND1
2
GND10
25
YGHF-S006T
39p
C601
100ohm
R602
ANT_SW3
ANT_SW2
ANT_SW1
MODE
Tx 1GHz
Tx 2GHz
Rx EGSM
Rx DCS
TX PCS
VDD
ON
ON
ON
ON
ON
VCTRL1
ON
ON
OFF
OFF
OFF
VCTRL2
OFF
ON
ON
OFF
OFF
VCTRL3
OFF
OFF
OFF
ON
OFF
Figure 40 FEM schematic