1
2. The detail of system’s modules
U101 is AP&BP complex processor，U202 is a complex memory which includes ddr
and rom and be shared for AP and BP. Only they all work normally，the system can boot
normally.
2.1 RF module
2.1.1 Transceiver
U1101 is the transceiver which supports GSM and WCDMA mode.
Figure 2 RF transceiver
2.1.2 GSM signal’s path
1.
Tx path
As the figure 3，the high band (1900/1800) and low band(850/900) come from U1101
Figure 3 GSM’s high and low bands signals come out from the U1101
