LG KT520 Service Manual page 76

D. Power Amplifier Module
The SKY77174 Power Amplifier module is a fully matched 10-pad surface mount module developed
for Wideband Code Division Multiple Access (WCDMA) applications. This small and efficient power
amplifier packs full coverage of the 1920 - 1980 MHz bandwidth into a single compact package.
WTX_BAND_1_EN
WPA_BIAS
C205
C207 10p
22p
C208
WTXMOD_BAND_I
56p
C211 C210
DNI DNI
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3-7-5. SKY77174 Functional Block Diagram
VCC_PA
C201
0.01u
C204
1000p C206
1000p
U201 SKY77174
1 11
VCC1 PGND
2 10
ENABLE VCC2
3 9
L201
VCONTROL GND3
1.5nH
4 8
RF_IN RF_OUT
VBAT
7
GND2
10nH
5 6
L203
VBIAS GND1
Figure 3-7-6. WCDMA PAM schematic
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3. TECHNICAL BRIEF
LDC181G9519B-327
N201
1 6
IN M_OUT
2 5
GND1 GND2
C212
3 4
0.5p
C_OUT TERMINATE
WPOW_SENSE
IS201 CES201G95DCB000
GND1 GND2
IN OUT WTX_BAND_1
GND3 GND4
LGE Internal Use Only