Rf Circuit Technical Brief; General Description - LG GD910 Service Manual

4. RF Circuit Technical Brief

4.1 General Description

The PMB 6952 SMARTi 3GE combines the SMARTiPM tri-band GSM/EDGE and SMARTi3G triple-band W-CDMA
transceivers in a laminate based PG-TFSGA-121-2 package. A significant circuit board area reduction is
achieved compared to using separately packaged transceivers. SMARTiPM is a tri-band transceiver for
GSM900/ GSM1800/GSM1900 voice and data applications. SMARTiPM features a direct conversion receiver
and a quad-band polar modulator transmitter for GSM and EDGE.
PMB8878 PMB8878
26MHz_MCLK 26MHz_MCLK
S-GOLD®3H S-GOLD®3H I/IX I/IX I/IX I/IX
Q/QX Q/QX Q/QX Q/QX
TXON_PA TXON_PA TXON_PA TXON_PA
PA PA PA PA
PA_BAND PA_BAND PA_BAND PA_BAND
Control Control Control Control
PA_LEVEL PA_LEVEL PA_LEVEL PA_LEVEL
Hardware Hardware Hardware Hardware
MODE MODE MODE MODE
ANT_SW1 ANT_SW1
GSM GSM GSM GSM
ANT_SW2 ANT_SW2 ANT_SW2 ANT_SW2
Timer Unit Timer Unit Timer Unit Timer Unit
RF_EN RF_EN RF_EN RF_EN
RF Control RF Control RF Control RF Control
RF_DA RF_DA RF_DA RF_DA
Unit Unit Unit Unit
RF_CLK RF_CLK RF_CLK RF_CLK
VCTCXO VCTCXO
AFC AFC AFC AFC
26MHz 26MHz 26MHz 26MHz
BT_CLK BT_CLK BT_CLK BT_CLK
26MHz_MCLK 26MHz_MCLK 26MHz_MCLK 26MHz_MCLK
VBAT VBAT VBAT VBAT VBAT VBAT VBAT
PMB6821 PMB6821 PMB6821 PMB6821 PMB6821
(SM-Power) (SM-Power) (SM-Power) (SM-Power) (SM-Power) (SM-Power) (SM-Power)
RF1.5V RF1.5V RF1.5V RF1.5V RF1.5V RF1.5V RF1.5V
RF2.85V RF2.85V RF2.85V RF2.85V RF2.85V RF2.85V RF2.85V
EN/DATA/CLK EN/DATA/CLK EN/DATA/CLK EN/DATA/CLK
TXI/TXIX TXI/TXIX TXI/TXIX TXI/TXIX
TXQ/TXQX TXQ/TXQX TXQ/TXQX TXQ/TXQX
PA_EN PA_EN PA_EN PA_EN
PA_MODE PA_MODE PA_MODE PA_MODE
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
PMB6952(SMARTi PM) PMB6952(SMARTi PM)
ADC ADC ADC ADC
3-Wire 3-Wire 3-Wire 3-Wire
Sigma-Delta Sigma-Delta Sigma-Delta Sigma-Delta
Bus Bus Bus Bus
Modulator Modulator Modulator Modulator
interface interface interface interface
Fractional Fractional Fractional Fractional
N-PLL N-PLL N-PLL N-PLL
3.8GHz 3.8GHz 3.8GHz 3.8GHz
Loop filter Loop filter Loop filter Loop filter
[Figure 4.1-1] Block Diagram of RF part
4. RF Circuit Technical Brief
GD910 service manual
RF2.85V RF2.85V
FEM(LSHSP43QL-771) FEM(LSHSP43QL-771)
LNA LNA LNA LNA
RX RX
850MHz 850MHz
RX RX
900MHz 900MHz 900MHz 900MHz
/4 /4 /4 /4
RX RX RX RX
1800MHz 1800MHz 1800MHz 1800MHz
RX RX RX RX
1900MHz 1900MHz 1900MHz 1900MHz
/2 /2 /2 /2
PGA PGA PGA PGA
TX TX TX TX
850/900MHz 850/900MHz 850/900MHz 850/900MHz
Polar Polar Polar Polar
TX TX TX TX
Modulator Modulator Modulator Modulator
1800/1900MHz 1800/1900MHz 1800/1900MHz 1800/1900MHz
VBAT VBAT VBAT VBAT
TXON_PA TXON_PA TXON_PA TXON_PA
PA_LEVEL PA_LEVEL PA_LEVEL PA_LEVEL
- 45 -
- -
SAW SAW
Switch Switch Switch Switch
3G BAND1 3G BAND1
3G BAND8 3G BAND8
Decoder Decoder Decoder Decoder
SKY77340 SKY77340
3G DUPLEXER 3G DUPLEXER
Rx Rx
H/LBAND H/LBAND
MODE MODE MODE MODE
Rx Rx
3G LNA 3G LNA 3G LNA 3G LNA
Rx RF SAW Rx RF SAW Rx RF SAW Rx RF SAW
Tx Tx
3G PAM 3G PAM 3G PAM 3G PAM
Tx RF SAW Tx RF SAW
PA_EN PA_EN PA_EN PA_EN
PA_MODE PA_MODE PA_MODE PA_MODE
LGE Internal Use Only
Tx Tx