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LG-KD3500
ANT
TX
RX
Keypad
Backlight
LCD
Backlight
Viblator
Keypad
SPK/Earpiec
MIC
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 3-1] Block Diagram Of RD3500
RD3500 Block Diagram
BPF
LN
BPF
Output
User
SPK AMP
I/F
15/21
Quadrature
RF Block
Quadrature
QSC6010
Memory
RF
Interface
Input
BB & PM
Connectivity
Codec
General
MCP
32Mb X 16Mb
DC 5V
Battery
UIM
USB
19.2M OSC
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