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Cellular Phone
SGH-2200 - GSM Service Manual
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3-1
Mixer 1 Mixer 2 I .I PGA Q .Q I&Q Demo. Rx SAW filter IF SAW Filter (225MHz) LC Filter (45MHz) 45MHz bias circuit Serial data interface CLK SDATA LE GSM : 1150-1185MHz PCN : (Rx) 1580-1655MHz (Tx) 1575-1650MHz 270MHz RF VCO
1805-1880MHz
LNA
925-960MHz
3-1 RF Block Diagram
3. Block Diagram
LNA
Rx filter
Dual synth.
PLL1
HD155121F
÷2
90° Shift ÷2
PLL2 90MHz ÷6
Dip.
VC1 VC2 IF VCO 540MHz
DCS : 270MHz GSM : 540MHz
90° Shift ÷2
LPF
LPF
Ant. S/W
VCTCXO 13MHz
GSM : 270MHz DCS : 135MHz
GSM : 270MHz DCS : 135MHz
880-915MHz I .I Loop fitter Phase Detector I&Q Mod. Q .Q
1710-1785MHz
Directional Coupler
PA Module Tx VCO
APC
Block Diagram
Block Diagram
Voiceband/Baseband Codec (AD642d1) Flash ROM
I/Q BB Filter
3-2 Baseband Block Diagram
Head set Buzzer
Audio Interface
SPK Mic.
Batteru Voltage
Audio Interface
Battery Temperature
I,Q
System RAM
RF Interface
Ramp cont. AGC AFC
PLL
Graphic LCD
GSM Processor (AD6426) BB Interface
13Mhz Clock
Serial Data Interface
3V SYNTH
I/O Interface EEPROM
3V BRIGHT
SIM card Interface
+3V SIM Card +5V SIM Card
XVCC
Charging Circuit
3V TX
KeyPad
VCC
Li-on Battery (3.6V, 1000mAh)
DC/DC Converter
LDO Regulators
AVCC
RTC 3V3
3-2
3-3
Rx filter Filter FET Switch FRT 4.1V 2nd Regulator 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
3-3 DTC Block Diagram
INPUT 9V DC
Switching TR Circuit UVLO Overcurrent Protector
Block Diagram
Block Diagram
3-4 HFK Block Diagram
5V Regulator
Power (12V-28V)
Stabilizer
Power Control
DC/DC Regulator
Current Delector
Ignition
Voltage/Current Feed Back
Cradle
MICOM Data Communication EEPROM DSP TX Amp Calibration CODEC RX Amp Microphone
Volume Control
Audio Amp
Speaker
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