Samsung SGH-X700 service manual.pdf

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1. Specification
1-1. GSM General Specification
GSM900
Phas e 1
Fr eq. Band[MHz]
Uplink/ Downli nk
ARFCN r ange
Tx/ Rx s paci ng
Mod. Bit r ate
/ Bit Pe r iod
T ime Slot Period
/ F rame Peri od
Modulati on
MS Power
Power Cl a ss
Sensit ivit y
TDMA Mux
Cell Radius
890~915
935~960
1~124
45MHz
270.833kbps
3.692us
576.9us
4.615ms
0.3GMSK
33dBm~5dBm
5pcl ~ 19pcl
- 102dBm
8
35Km
EGSM 900
Phas e 2
880~915
925~960
0~124 &
975~1023
45MHz
270.833kbps
3.692us
576.9us
4.615ms
0.3GMSK
33dBm~5dBm
5pcl ~ 19pcl
-102dBm
8
35Km
DCS1800
Phas e 1
1710~1785
1805~1880
512~885
95MHz
270.833kbps
3.692us
576.9us
4.615ms
0.3GMSK
30dBm~0dBm
0pcl ~ 15pcl
- 100dBm
8
2Km
PCS1900
1850~1910
1930~1990
512~810
80MHz
270.833kbps
3.692us
576.9us
4.615ms
0.3GMSK
30dBm~0dBm
0pcl ~ 15pcl
- 100dBm
8
-
1-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Specification
1-2. GSM TX power class
TX Power
control level
5
GSM900
TX Power
control level
0
DCS1800
TX Power
control level
0
PCS1900
33±3 dBm
30±3 dBm
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
1-2
0±5 dBm
15
0±5 dBm
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2. Circuit Description
2-1. SGH-X700 RF Circuit Description
2-1-1. RX PART
- FRONT END MODULE(ANTENNA SWITCH MODULE + RX SAW FILTER) (U100)
It performs to switch Tx & Rx paths for GSM900, DCS1800 and PCS1900 with logic controls below.
- FEM Control Logic Table
FESW1
Tx Mode (GSM900)
Tx Mode (DCS1800/1900)
Rx Mode (GSM900)
Rx Mode (DCS1800)
Rx Mode (PCS1900)
H
L
L
L
L
FESW2
L
H
L
L
L
- VC-TCXO (TCX100)
This module generates the 26MHz reference clock to drive the logic and RF systems.
It is turned on when the supply voltage (+VCC_SYN_2V8) is applied.
After buffering, the 26MHz reference clock is supplied to the other parts of the system through the transceiver pin
CLKOUT.
- Transceiver (U102)
This chip is fully integrated GSM & GPRS tri-band transceiver with RF VCO, loop filters and most of the
passive components required in it.
It 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, performs gain control to tune the 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.
2-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used with
out Samsung's authorization

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