Samsung SGH-X460 service manual, GSM, Service Manual, Samsung, Seria X, Samsung SGH-X460
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SERVICE
Manual
GSM TELEPHONE
CONTENTS
ELECTRONICS
꣏
1. GSM General Specification
G S M 9 0 0
P h a s e 1
E G S M 9 0 0
P h a s e 2
D C S 1 8 0 0
P h a s e 1
F r e q . B a n d [ M H z ]
U p l i n k / D o w n l i n k
8 9 0 ~ 9 1 5
9 3 5 ~ 9 6 0
8 8 0 ~ 9 1 5
9 2 5 ~ 9 6 0
1 7 1 0 ~ 1 7 8 5
1 8 0 5 ~ 1 8 8 0
A R F C N r a n g e
1 ~ 1 2 4
0 ~ 1 2 4 &
9 7 5 ~ 1 0 2 3
5 1 2 ~ 8 8 5
T x / R x s p a c i n g
4 5 M H z
4 5 M H z
9 5 M H z
M o d . B i t r a t e /
B i t P e r i o d
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
T i m e S l o t
P e r i o d / F r a m e P e r i o d
5 7 6 . 9 u s
4 . 6 1 5 m s
5 7 6 . 9 u s
4 . 6 1 5 m s
5 7 6 . 9 u s
4 . 6 1 5 m s
M o d u l a t i o n
0 . 3 G M S K
0 . 3 G M S K
0 . 3 G M S K
M S P o w e r
3 3 d B m ~ 1 3 d B m
3 3 d B m ~ 5 d B m
3 0 d B m ~ 0 d B m
P o w e r C l a s s
5 p c l ~ 1 5 p c l
5pcl ~ 19pcl
0pcl ~ 15pcl
S e n s i t i v i t y
- 1 0 2 d B m
- 1 0 2 d B m
- 1 0 0 d B m
T D M A M u x
8
8
8
C e l l R a d i u s
3 5 K m
3 5 K m
2 K m
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2. GSM TX power class
TX Power
control level
GSM900
TX Power
control level
DCS1800
5
33ꆾ2 dBm
0
30ꆾ3 dBm
6
31
ꆾ
2 dBm
1
28ꆾ3 dBm
7
29ꆾ2 dBm
2
26
ꆾ
3 dBm
8
27ꆾ2 dBm
3
24ꆾ3 dBm
9
25ꆾ2 dBm
4
22ꆾ3 dBm
10
23ꆾ2 dBm
5
20ꆾ3 dBm
11
21
ꆾ
2 dBm
6
18
ꆾ
3 dBm
12
19ꆾ2 dBm
7
16ꆾ3 dBm
13
17
ꆾ
2 dBm
8
14
ꆾ
3 dBm
14
15ꆾ2 dBm
9
12ꆾ4 dBm
15
13
ꆾ
2 dBm
10
10
ꆾ
4 dBm
16
11ꆾ3 dBm
11
8
ꆾ
4dBm
17
9
ꆾ
3dBm
12
6ꆾ4 dBm
18
7ꆾ3 dBm
13
4
ꆾ
4 dBm
19
5ꆾ3 dBm
14
2ꆾ5 dBm
15
0
ꆾ
5 dBm
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ꖰ
A. RX PART
1. ASM(U102)
ꇦ
Switching Tx, Rx path for GSM900, DCS1800 by logic controlling.
2. ASM Control Logic
ꇦ
Truth Table
VC_1
VC_2
GSM Tx Mode
H
L
DCS Tx Mode
L
H
GSM Rx Mode
L
L
DCS Rx Mode
L
L
3. FILTER
To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency
band.
- GSM FILTER (F100)
ꇦ
For filtering the frequency band between 925 ~ 960 MHz
- DCS FILTER (F101)
ꇦ
For filtering the frequency band 1805 and 1880 MHz.
4. VC-TCXO (OSC101)
To generate the 26MHz reference clock to drive the logic and RF.
After additional process, the reference clock applies to the U100 Rx IQ demodulator and Tx
IQ modulator.
The oscillator for RX IQ demodulator and Tx modulator are controlled by serial data to select
channel and use fast lock mode for GPRS high class operation.
5. UAA3536(U100)
This chip integrates two differential-input LNAs.
The GSM input supports the E-GSM, DCS input supports the DCS1800. The LNA inputs are
matched to the 150 ohm differential output SAW filters through external LC matching network.
Image-reject mixer downconverts the RF signal to a 100 KHz intermediate frequency(IF) with
the RFLO from OSC100 voltage-controlled oscillator. The RFLO frequency is between 1801 ~
1921 MHz.
The Mixer output is amplified with an analog programmable gain amplifier(PGA), which is
controlled by AGAIN.
The quadrature IF signal is digitized with high resolution A/D converts (ADC).
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