Block Diagrams
4-3
4-2-1 RF Tx Part
SGH-N288
RF
Bloc
k
Dia
gram
-
T
x
P
ar
t
a
b
c
d
e
-
GSM
:
T
x
le
v
el
5
@
6
0
CH
-
DCS
:
T
x
le
v
el
0
@
6
9
8
C
H
U605
HD155128TF
Antenna
S/W
U602
U501
VP40575
TXEN
RAMPD
A
C
BAND Selection
- GSM :
Lo
w
- DCS :
High
ITXP
ITXN
QTXP
QTXN
Loop
Filter
TX VCO
U610
Dual P
A
M
U608
APC IC
U611
890
~
915
MHz
1710
~
1785
MHz
Coupler
15
9
4
4
3
3
U607
U609
1
1
13
7
2
540 MHz
PCN :
1575 ~ 1650 MHz (Tx)
GSM :
1150 ~ 1185 MHz
41
4
1
1
4
5
38
35
20
19
18
17
30
47
5
1
8
1
4
2
3
2
19,
20
Ant.
S/W
Control
Circuit
3VTX
TXEN2
VC1
VC2
VC3
VC3
VC2
VC1
GSM(Tx)
DCS(Tx)
Rx
H
H
H
L
L
L
L
LL
11
SI4133-MLP28
U612
VCTCXO
13MHz
U613
IF VCO
1080MHz
PLL1
PLL2
RF VCO
AFCD
A
C
10
23
15
3
2
1
