Only For Training And Service Purposes - LG GU280 Service Manual

3. Technical Brief
3.3.2. Receiver Part
There are two recommended GSM receiver path configurations; both are shown in Figure 1.3.2.1.
The configuration shown on top allows the GSM 850 and GSM 1900 bands to share the UMTS 850 and UMTS 1900
paths for US applications and uses four LNA inputs to support quad-band GSM operation.
The lower example uses two LNAs for quad-band GSM operation (one low band and one high band),
with two-way SAW filters between the antenna switch and the QSC inputs for each band type.
LGE Internal Use Only
Figure 1.3.1.1 QSC GSM transmitter signal paths functional diagram
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Only for training and service purposes