Text preview for : SGH_800BA_TEC13.pdf part of Samsung SGH-800C Service Manual - (File 6) pag. 53
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3. Block Diagram
3-1 RF Block Diagram
225 MHz 935 ~ 960 MHz LNA RX SAW filter IF SAW filter 270 MHz RX SAW bias circuit
45 MHz LC filter AGC I&Q Demo. I O
45 MHz
HD 155101BF
1160 ~ 1185 MHz VCTCXO 13MHz Ant S/W TCO-999 LMX2336L Dual synth. B.B. Block RF VCO /2 90 deg Shift /2
PLL1
PLL2 540 MHz
/6
LPF 270 MHz 890 ~ 915 MHz
90 deg Shift /2
270 MHz P.A. TX SAW TX VCO Loop filter Phase Detector 270 MHz I&Q Mod I O
Samsung Electronics
3-1
3-2 Baseband Block Diagram
System Clock
GSM/DCS Memory VOCODER
SIM Card Serial Data Interface
+3V SIM Card
+5V SIM Card I/O Interface
System RAM 4M
B.B Interface A/D Interface
Battery Voltage
System memory
Battery Temperature I/O BB Filter RF 3V Tx
Flash ROM 16M
GSM/DCS KERNEL 5
RF Interface
AGC, AFC 3.0V PLL 3V BRIGHT 3V SYNTH
EEPROM 128K
8M ROM (Voice Recognition) Charging Circuit
KeyPad 3.6V Li_lon Battery (3.6V) Graphic LCD Ni_MH Battery (3.6V) 3.6V
DC/DC Converter
LDO Regulators
3.0V
AVCC
VCC BB LDO Regulator
3.3V
RTC VCC
3-2
Samsung Electronics
Samsung Electronics
2nd Regulator FRT 4.1V Filter FET Switch Reference Voltage LED Overheat Protector MPU Battery Type Detector Charge Voltage Detector Charge Voltage Selector Feed Back Static Current Circuit Static Voltage Circuit FET Switch REAR 4.1V
CHOKE COIL
3-3 DTC Block Diagram
INPUT 9V DC
Switching TR Circuit UVLO Overcurrent Protector
3-3
3-4
3-4 HFK Block Diagram
5V Regulator
Power
(12V-28V)
Stabilizer
Power Control
DC/DC Regulator
Current Detector
Ignition
Voltage/Current Feed Back
Cradle
MICOM Data Communication EEPROM DSP TX Amp Calibration CODEC RX Amp Microphone
Samsung Electronics
Volume Control
Audio Amp
Speaker