LG -ID3100 Service Manual page 16

LG-ID3100
RF500(U101)
Mobile S/W
ANT IL : 0.4~0.5dB
PA
TX
V ref=2.85V
SKY77162(U102)
RX
EFSD836MF1S2(DP101)
TX IL 1.5 ~ 2.3 dB EFCH881MTCA7(F103)
IL = 1.5~2.0 dB
RX IL 2.3 ~ 3.5 dB
ANT(Headset)
Keypad
Backlight
LCD
Backlight
FM
Receiver
Viblator
AMP
Keypad
SPK/Earpiece
1.2 Description of Receive Part Circuit
1.2.1 Duplexer (DP101)
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 3.5dB (Max).
The receive band attenuation amount of transmit filter is 45dB (Min) and the transmit band attenuation
amount of receive filter is 57dB or more (Min).
LGE
LG Electronics Inc.
[Figure 2-1] Block Diagram Of ID3100
B9426(F110)
IL=1.5~2.3 dB
BPF
LNA
BPF
Output
Voltage
Reguration
User
Interface
SPK AMP
I/F
MIC
(MIC/EAR)
Quadrature
Upconverter
RF Block
Quadrature
Downconverter
QSC6010
Memory
RF
Interface
Interface
Input Power
Management
BB & PM Block
Connectivity
Codec
General
Housekeeping
14/57
MCP
64Mb X 32Mb
DC 5V
Battery
UIM
UART
19.2M OSC
LGE Internal Use Only