User Guide

4-3 Block Diagrams
4-2-1 RF Transmit Part
a b c
de
U305
HD155128TF
Antenna
S/W
U304
U108
VP40575
TXEN
RAMPDAC BAND Selection - GSM : Low - DCS : High
ITXP
ITXN
QTXP
QTXN
Loop
Filter
TX VCO
U200
Dual PAM
U312
APC Circuit
Coupler
153
1 3
7
5
U318
U318
8
8
13 7
2
540 MHz
PCN : 1575 ~ 1650 MHz (Tx)
GSM : 1150 ~ 1185 MHz
41411
1
2
34
5
38 35 20 19
18
17
30 47
10
6
8 14
2 5
2
1
Ant. S/W
Control
Circuit
3VTX TXEN2
VC1 VC2 VC3
VC3VC2VC1
GSM(Tx)
DCS(Tx)
Rx
H
H
H
LL LL
LL
11
SI4133-MLP28
U302
VCTCXO
13MHz
U303
IF VCO
1080MHz
PLL1
PLL2
RF VCO
AFCDAC
10 23
15
880 ~ 915MHz(EGSM) 890 ~ 915MHz(PGSM)
1710 ~ 1785MHz(DCS)