Block Diagrams
4-3
4-2-1 RF Transmit Part
a
b
c
d
e
U305
HD155128TF
Antenna
S/W
U304
U108
VP40575
TXEN
RAMPD
A
C
BAND Selection
- GSM :
Lo
w
- DCS :
High
ITXP
ITXN
QTXP
QTXN
Loop
Filter
TX VCO
U200
Dual P
A
M
U312
APC Circuit
Coupler
15
3
1
3
7
5
U318
U318
8
8
13
7
2
540 MHz
PCN :
1575 ~ 1650 MHz (Tx)
GSM :
1150 ~ 1185 MHz
41
4
1
1
1
2
3
4
5
38
35
20
19
18
17
30
47
10
6
8
1
4
2
5
2
1
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
U302
VCTCXO
13MHz
U303
IF VCO
1080MHz
PLL1
PLL2
RF VCO
AFCD
A
C
10
23
15
880 ~ 915MHz(EGSM)
890 ~ 915MHz(PGSM)
1710 ~ 1785MHz(DCS)
U301
HD155128TF
Antenna
S/W
U401
U110
VP40578
TXEN
RAMPD
A
C
BAND Selection
- GSM :
Lo
w
- DCS :
High
ITXP
ITXN
QTXP
QTXN
Loop
Filter
TX VCO
U302
Dual P
A
M
U404
APC IC
U404
890
~
915
MHz
1710
~
1785
MHz
15
3
1
3
7
5
DIrectional
Coupler
U402
8
35
8
540 MHz
PCN :
1575 ~ 1650 MHz (Tx)
GSM :
1150 ~ 1185 MHz
2
11
1
2
3
4
5
38
35
20
19
18
17
30
47
10
6
8
1
4
2
5
2
19
Ant.
S/W
Control
Circuit
3VTX
TXEN2
VC1
VC2
VC2
VC1
DCS(Tx)
GSM(Tx)
Rx
H
H
L
L
LL
11
SI4133-MLP28
U304
VCTCXO
13MHz
U305
IF VCO
1080MHz
PLL1
PLL2
RF VCO
AFCD
A
C
10
23
15
14
RF
Conn.
J401
1
2