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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.5.5 GSM PAM (U102 : SKY77329)
The SKY77329 Power Amplifier Module (PAM) is designed in a compact form factor for quad-band
cellular handsets comprising GSM850/900, DCS1800, PCS1900, and supports Class 12 General
Packet Radio Service (GPRS) multi-slot operation.
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance
matching circuitry for 50 Ω input and output impedances, and a Power Amplifier Control (PAC) block.
A custom CMOS integrated circuit provides the internal PAC function and interface circuitry.
Two separate Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto InGaP/GaAs die;
one supports the GSM850/900 bands, the other supports the DCS1800 and PCS1900 bands. Both PA
blocks share common power supply pins to distribute current. The GaAs die, the silicon die, and the
passive components are mounted on a multi-layer laminate substrate and the entire assembly is
encapsulated with plastic overmold.
3. TECHNICAL BRIEF
- 30 -
[Figure 1. 8] GSM PAM Schematic
GSM_PA_BAND
NEAR TO PAM
HIGH
10dB
DCS/PCS
MODE
6dB
LOW
GSM
C122
8.2p
C131
68p
R111
68
C136
33p
91
R112
C133
NA
L117
1.5nH
18nH
L115
2.2K
R110
8.2nH
L116
15p
C144
R118
100ohm
NA
C134
15p
C143
R115
39
C132
33u
22
PGND7
23
24
PGND8
25
PGND9
4
RSVD1
8
RSVD2
12
RSVD3
TX_EN
1
6
VAPC
VBATT
5
PGND1
PGND10
26
PGND11
27
PGND12
28
29
PGND13
30
PGND14
PGND15
31
32
PGND16
33
PGND17
PGND18
34
PGND19
35
18
PGND2
36
PGND20
PGND3
19
PGND4
20
21
PGND5
PGND6
SKY77329
U102
BS
3
DCS_PCS_IN
2
16
DCS_PCS_OUT
GND1
10
GND2
11
13
GND3
GND4
14
15
GND5
7
GSM_IN
9
GSM_OUT
17
R113
91
100ohm
R117
3
G3
5
IN
1
O1
4
FL100
EFCH897MTDB1
G1
2
G2
100ohm
R119
R116
100ohm
DCS_PCS_TX
+VPWR
GSM_PA_RAMP
GSM_PA_BAND
GSM_PA_EN
GSM_TX
Содержание Vodafone KU380
Страница 1: ...Date December 2007 Issue 1 0 Service Manual KU380 Service Manual Model KU380 Internal Use Only ...
Страница 151: ... 152 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 157: ... 158 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 188: ...Note ...
Страница 189: ...Note ...