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4-2-1 RF Transmit Part
1
2
3
4
5
U601
HD155128TF
Antenna
S/W
U706
U108
VP40575
TXEN
RAMPD
A
C
BAND Selection
- GSM :
Lo
w
- DCS :
High
ITXP
ITXN
QTXP
QTXN
Loop
Filter
TX VCO
U602
Dual P
A
M
U707
APC Circuit
Coupler
15
9
1
1
6
6
U700
U702
3
3
35
2
540 MHz
PCN :
1575 ~ 1650 MHz (Tx)
GSM :
1150 ~ 1185 MHz
21
1
1
2
3
4
5
38
35
20
19
18
17
30
47
5
1
8
1
4
2
5
2
1
Ant.
S/W
Control
Circuit
3VTX
TXEN2
VC1
V
C2
VC3
VC3
VC2
VC1
GSM(Tx)
DCS(Tx)
Rx
H
H
H
L
L
L
L
LL
11
SI4133-MLP28
U501
VCTCXO
13MHz
U500
IF VCO
1080MHz
PLL1
PLL2
RF VCO
AFCD
A
C
10
23
15
880 ~ 915MHz(EGSM)
890 ~ 915MHz(PGSM)
1710 ~ 1785MHz(DCS)
4-3
Exploded Views and Parts List