Gsm Mode - LG GW620 Servise Manual

3. Technical Brief

3.2 GSM MODE

3.2.1 GSM RECEIVER
The GSM-850, GSM-900, GSM-1800, and GSM-1900 receiver inputs of RTR6285 are connected to the
transceiver front-end circuits(switch module) through saw filters. GSM-850, GSM-900, GSM-1800, and GSM-
1900 receiver inputs use differential configurations to improve common-mode rejection and second-order
non-linearity performance as shown in Figure 1-2. The balance between the complementary signals is critical
and must be maintained from the RF filter outputs all the way into the IC pins
LGE Internal Use Only
[Figure 1-2] GSM Receiver Inputs Topologies
- 20 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
GW620