User Guide

4-3 Block Diagrams
4-2-1 RF Tx Part
SGH-N628 RF Block Diagram - Tx Part
- GSM : Tx level 5 @ 60 CH - DCS : Tx level 0 @ 698 CH
U605
HD155128TF
Antenna
S/W
U602
U501
VP40575
TXEN RAMPDAC BAND Selection - GSM : Low - DCS : High
ITXP
ITXN QTXP QTXN
Loop Filter
TX VCO
U610
Dual PAM
U608
APC IC U611
890
~
915
MHz
1710
~
1785
MHz
Coupler
159
4 4
3
3
U607
U609
1
1
35
8
540 MHz
PCN : 1575 ~ 1650 MHz (Tx) GSM : 1150 ~ 1185 MHz
2
4
5
38 35 20 19 18 17
30 47
5 1
8 14
2 5
2
19, 20
Ant. S/W
Control
Circuit
3VTXRx TXEN2
VC1 VC2
VC2VC1
GSM(Tx) DCS(Tx)
Rx
H
H L
L LL
11
SI4133-MLP28
U612
VCTCXO
13MHz
U613
IF VCO
1080MHz
PLL1 PLL2
RF VCO
AFCDAC
10 23
15
3
2
1