Samsung SGH-X700 service manual, samsung service manuals schematy serwisowki
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䝓 䕌䕐䡏久
升䠭堷〰
䝓 䕌䕐低
䍏乔䕎呓
ㄮ 印散楦楣楯
㈮ 䍩牣畩 䑥獣楰瑩潮
㌮ 䕸灬潤敤 噩敷 偡 楳
㐮 䕬散瑲捡 偡牴 楳
㔮 䉬潣 楡杲慭
㘮 偃 楡杲
㜮 䙬潷 䍨慲 牯汥獨潯瑩
周楳 卥楣 慮畡 潰敲 潦 卡浳畮 湩捳 䍯⸬瑤
湡畴桯 潦 䵡 湤敲 慰灬楣慢汥
牮慴湡 湤⽯ 潭敳瑩 慷
꣏
浳 汥捴牯湩 䍯⸬䱴搮 散敭扥爮
偲楮瑥 潲敡
䍯 漮 䝈㠭〸㤶㥁
䉁卉䌮
1. Specification
1-1. GSM General Specification
GSM900
Phase 1
EGSM 900
Phase 2
DCS1800
Phase 1
PCS1900
Freq. Band[MHz]
Uplink/Downlink
890~915
935~960
880~915
925~960
1710~1785
1805~1880
1850~1910
1930~1990
ARFCN range
1~124
0~124 &
975~1023
512~885
512~810
Tx/Rx spacing
45MHz
45MHz
95MHz
80MHz
Mod. Bit rate
/BitPeriod
270.833kbps
3.692us
270.833kbps
3.692us
270.833kbps
3.692us
270.833kbps
3.692us
Time Slot Period
/ Frame Period
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
Modulation
0.3GMSK
0.3GMSK
0.3GMSK
0.3GMSK
MS Power
33dBm~5dBm 33dBm~5dBm 30dBm~0dBm
30dBm~0dBm
Power Class
5pcl ~ 19pcl
5pcl ~ 19pcl
0pcl ~ 15pcl
0pcl ~ 15pcl
Sensitivity
-102dBm
-102dBm
-100dBm
-100dBm
TDMA Mux
8
8
8
8
Cell Radius
35Km
35Km
2Km
-
1-1
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Specification
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
1-2
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This Document can not be used without Samsung's authorization
㈮ 䍩捵楴 敳捲楰瑩潮
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
FESW2
Tx Mode (GSM900)
H
L
Tx Mode (DCS1800/1900)
L
H
Rx Mode (GSM900)
L
L
Rx Mode (DCS1800)
L
L
Rx Mode (PCS1900)
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.
㈭
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周楳 䑯捵浥湴 捡 潴 扥 敤 睩瑨 潵 獵湧❳ 慵瑨潲楺慴楯
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