Samsung SGH-E730 service manual, samsung service manuals schematy serwisowki
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꣏
1-1. 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
P C S 1 9 0 0
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
1 8 5 0 ~ 1 9 1 0
1 9 3 0 ~ 1 9 9 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
5 1 2 ~ 8 1 0
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
8 0 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
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
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
0 . 3 G M S K
M S P o w e r
3 3 d B m ~ 5 d B m
3 3 d B m ~ 5 d B m
3 0 d B m ~ 0 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 9 p c l
5pcl ~ 19pcl
0pcl ~ 15pcl
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
- 1 0 0 d B m
T D M A M u x
8
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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1-2. GSM TX power class
TX Power
control level
GSM900
TX Power
control level
DCS1800
TX Power
control level
PCS1900
5
33±3 dBm
0
30±3 dBm
0
30±3 dBm
6
31±3 dBm
1
28±3 dBm
1
28±3 dBm
7
29±3 dBm
2
26±3 dBm
2
26±3 dBm
8
27±3 dBm
3
24±3 dBm
3
24±3 dBm
9
25±3 dBm
4
22±3 dBm
4
22±3 dBm
10
23±3 dBm
5
20±3 dBm
5
20±3 dBm
11
21±3 dBm
6
18±3 dBm
6
18±3 dBm
12
19±3 dBm
7
16±3 dBm
7
16±3 dBm
13
17±3 dBm
8
14±3 dBm
8
14±3 dBm
14
15±3 dBm
9
12±4 dBm
9
12±4 dBm
15
13±3 dBm
10
10±4 dBm
10
10±4 dBm
16
11±5 dBm
11
8±4dBm
11
8±4dBm
17
9±5 dBm
12
6±4 dBm
12
6±4 dBm
18
7±5 dBm
13
4±4 dBm
13
4±4 dBm
19
5±5 dBm
14
2±5 dBm
14
2±5 dBm
15
0±5 dBm
15
0±5 dBm
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2-1. SGH-E730 RF Circuit Description
2-1-1. RX PART
- ANTENNA SWITCH (Module1 Front End Module)
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Switching Tx, Rx path for GSM900, DCS1800 and PCS1900 by logic controlling.
- ANTENNA SWITCH Control Losic (Module1)
ꇦ
Truth Table
VC1
VC2
VC3
Tx Mode (GSM900)
H
L
L
Tx Mode (DCS1800/1900)
L
H
L(H)
Rx Mode (GSM900)
L
L
L
Rx Mode (DCS1800)
L
L
L
Rx Mode (PCS1900)
L
L
H
- VC-TCXO (U102)
This module generates the 26MHz reference clock to drive the logic and RF.
It is turned on when the supply voltage Vcc(SYN) is applied.
After buffering a reference clock of 26MHz is supplied to the other parts of the system
through the transceiver pin CLKOUT.
- TRANSCEIVER (U100)
This chip is fully integrated GSM GPRS quad-band transceiver with transmit baluns(balanced-unbalanced matching devices)
, loop filters and most of the passive component in it.
And also fully integrated fractional N RF synthesizer with AFC control possibility, RF VCO with integrated supply
regulator. Semi integrated reference oscillator with integrated supply regulator.
RF Receiver front-end amplifies the E-GSM900, DCS1800 and PCS1900 aerial signal, convert the chosen channel
down to a low IF of 100kHz.
In IF section, further amplifies the wanted channel output level to the desired value and rejects DC.
2-1-2. TX PART
The transmitter is fully differential using a direct up conversion architecture. It consists of a signal side band
power up mixer. Gain is controlled by 6 dB via 3-wire serial bus programing. The fully integrated VCO and power
mixer achieve LO suppression, quadrature phase error, quadrature amplitude balance and low noise floor specification.
Output matching/balun components drive a standard 50 ohms single ended load.
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