LG KG70c Service Manual page 13

KG70C
provide signal drive capability to the power amp.
After that, the RF signal is amplified by the Power Amp in order to have enough power for radiation.
Finally, the RF signal is sent out to the cell site via the antenna after going through the duplexer
6.1.2 Description of Receive Part Circuit
6.1.2.1 Duplexer (DP100)
The duplexer consists of the receive part bandpass filter (BPF) and the transmit part bandpass filter
(BPF) which have the function of separating transmit/receive signals in the full duplex system using
the transmit/receive common antenna. The transmit part BPF is used to suppress noises and spurious
waves entering the receive band among transmit signals in order to prevent the drop in receive
sensitivity characteristics. The receive part BPF blocks the signals sent out from entering the receive
end in order to improve sensitivity characteristics.
Insertion loss (IL) in the transmit band is 2.8dB (Max), whereas IL in the receive band is 2.1dB (Max).
The receive band attenuation amount of transmit filter is 51dB (Min) and the transmit band attenuation
amount of receive filter is 45dB or more (Min).
F100 F100 F100
U108 U108 U108 U104 U104 U104
PAM PAM PAM Tx RF SAW Tx RF SAW Tx RF SAW
High Pwr Det High Pwr Det High Pwr Det
MAX2205 MAX2205 MAX2205 SKY77162 SKY77162 SKY77162 B9003 B9003 B9003
Status Status Status
U400 U400 U400
Tx: 824~ Tx: 824~ Tx: 824~
& ctls & ctls & ctls
849MHz 849MHz 849MHz PMIC PMIC PMIC
I2C & Mode Ctl Logic I2C & Mode Ctl Logic I2C & Mode Ctl Logic
Charging & Charging & Charging &
Charging Charging Charging
Power Supply Power Supply Power Supply
Conditioning Conditioning Conditioning
USB sgls USB sgls USB sgls
USB Transceiver USB Transceiver USB Transceiver
Single- Single- Single-
MAX1829 MAX1829 MAX1829
Band Ant. Band Ant. Band Ant.
Tx Tx Tx Tx
DP100 DP100 DP100
Rx Rx Rx Rx
Duplexer Duplexer Duplexer
U100 U100 U100
EFSD836MF2S2 EFSD836MF2S2 EFSD836MF2S2
Mobile S/W Mobile S/W Mobile S/W
KMS-512 KMS-512 KMS-512
Rx VCO Freq(Rx RF*2) Rx VCO Freq(Rx RF*2) Rx VCO Freq(Rx RF*2)
1738.08 ~1787.94 MHz 1738.08 ~1787.94 MHz 1738.08 ~1787.94 MHz
U107 U107 U107
RF Receiver RF Receiver RF Receiver
RFR6122 RFR6122 RFR6122
Rx: 869~ Rx: 869~ Rx: 869~
894MHz 894MHz 894MHz
LNA LNA LNA
F101 F101 F101
Rx RF SAW Rx RF SAW Rx RF SAW
B7838 B7838 B7838
U106 U106
RF Transmitter RF Transmitter
RFT6122 RFT6122 RFT6122
Quadrature Quadrature Quadrature
Upconverter Upconverter Upconverter
AGC AGC AGC
Gain Ctl Gain Ctl Gain Ctl
ctls ctls ctls ctls ctls ctls
LO Generation LO Generation LO Generation
Circuit Circuit Circuit
& Distribution & Distribution & Distribution
mode mode mode
L L L
mode mode mode
System System System
O O O
lock lock lock
G G G
I I I
LOCK LOCK LOCK
C C C
Fref Fref Fref
RX PLL RX PLL RX PLL
hold hold hold
Loop Loop Loop
filter filter filter
Rx VCO Rx VCO Rx VCO
LO Generation LO Generation LO Generation
& Distribution & Distribution & Distribution
Quadrature Quadrature Quadrature
Downconverter Downconverter Downconverter
AGC AGC AGC
[Figure 1-1] Block Diagram Of KG70c
U601 U601
Bluetooth RF Module Bluetooth RF Module
Bluetooth RF Bluetooth RF Bluetooth RF
LBRQ-2B43A LBRQ-2B43A
DAC_REF DAC_REF DAC_REF
VDDM VDDM VDDM
ctls ctls ctls
S S S
Control Control Control B B B
Circuits Circuits Circuits
I I I
TX_ON TX_ON TX_ON
lock lock lock
TX PLL TX PLL TX PLL
Tx RF Tx RF Tx RF
Fref Fref Fref
VCO VCO VCO
hold hold hold
Loop Loop Loop
19.2MHz 19.2MHz 19.2MHz
TRK TRK TRK
filter filter filter
Bluetooth Bluetooth Bluetooth VCTCXO VCTCXO VCTCXO
Reference Reference Reference
U101 U101 U101
TCX-Oscillator TCX-Oscillator TCX-Oscillator
TG-5000LA TG-5000LA TG-5000LA
VDDM VDDM VDDM
ctls ctls ctls
S S S
Control Control Control
B B B
Circuits Circuits Circuits
I I I
LPF LPF LPF LPF
LPF LPF LPF LPF
External Mode Selection External Mode Selection External Mode Selection
12
MSM6100 MSM6100 MSM6100
Bluetooth Bluetooth Bluetooth
(90n) (90n) (90n)
Baseband Baseband Baseband
UART1 UART1 UART1
Processor Processor Processor
UART2 UART2 UART2
DFM DFM DFM
USB USB USB UART3 UART3 UART3
PROCESSOR PROCESSOR PROCESSOR
TX TX TX
DACs DACs DACs T-flash Controller T-flash Controller T-flash Controller
R-UIM Controller R-UIM Controller R-UIM Controller
Memory Memory Memory
Controller Controller Controller
CDMA CDMA CDMA
SBI SBI SBI
PROCESSOR PROCESSOR PROCESSOR
ARM926EJ-S ARM926EJ-S ARM926EJ-S
HK ADCs HK ADCs HK ADCs
General-purpose Interface bus General-purpose Interface bus General-purpose Interface bus
Voltage Voltage Voltage
Camera Camera Camera
Regulator Regulator Regulator
Interface Interface Interface
LCD LCD LCD
Interface Interface Interface
General General General
PLL PLL PLL
Purpose Purpose Purpose
Interface Interface Interface
RF RF RF
Interface Interface Interface
QDSP4000 QDSP4000 QDSP4000
•Vocoder •Vocoder •Vocoder
gpsOne gpsOne gpsOne
•MP3 •MP3 •MP3
Processor Processor Processor
•CMX •CMX •CMX
SBI SBI SBI
Wideband Wideband Wideband
Stereo Stereo Stereo
CODEC CODEC CODEC
MPEG MPEG MPEG
Accelerator Accelerator Accelerator
Rx Rx Rx
Game Engine Game Engine Game Engine
ADCs ADCs ADCs
Java Java Java
Accelerator Accelerator Accelerator
JTAG Interface JTAG Interface JTAG Interface
MODE Select MODE Select MODE Select
Interface Interface Interface ETM ETM ETM
PC PC PC
Connectivity Connectivity Connectivity
Test/Debug Test/Debug Test/Debug
System System System
R-UIM R-UIM R-UIM
1G NAND 1G NAND 1G NAND
512M SDRAM 512M SDRAM 512M SDRAM
Peripheral Peripheral Peripheral
Microprocessor Bus Microprocessor Bus Microprocessor Bus
Circuits Circuits Circuits
Address/Data Address/Data Address/Data
U702 U702 U702
CL8237S4 CL8237S4 CL8237S4 2M AF 2M AF 2M AF
Multimedia Multimedia Multimedia CMOS CMOS CMOS
Application Application Application
240*320 240*320 240*320
Processor Processor Processor
262k QVGA 262k QVGA 262k QVGA
microSD microSD microSD
1 2 3 1 2 3 1 2 3 1 2 3
4 5 6 4 5 6 4 5 6 4 5 6
Keypad Keypad Keypad
7 8 7 8 7 8 7 8 9 9 9 9
* * * * 0 0 0 0 # # # #
AUDIO AUDIO AUDIO
Application Application Application
Processor Processor Processor
U501 U501 U501
YAMAHA YAMAHA YAMAHA
MIDI MIDI MIDI
Digital Test Bus Digital Test Bus Digital Test Bus