GSM1900 and LTE B2 share one RX channel.
W-CDMA
W-CDMA B1 and LTE B1 share the RX-TX channel.
W-CDMA B3 and LTE B3 share the RX-TX channel.
W-CDMA B5 and LTE B5 share the RX-TX channel.
W-CDMA B8 and LTE B8 share the RX-TX channel.
5.1.2.2 TX Circuit
GSM TX Circuit
The original GSM RF signal transmitted by the Transceiver (U1600) goes to the switch path, and then to
the PA (U1401) for amplification. Afterwards, the GSM RF signal goes to the ANT port, and then to the
antenna unit.
The GSM transmitting circuit includes GSM850/GSM900/GSM1800/GSM1900.
FDD TX Circuit
The original FDD RF signals are transmitted from the Transceiver (U1600). Some frequency bands first go
to the corresponding switch channel. Others go to the PA (U1203) for amplification, and then to the DUP
for filtering. Afterwards, the filtered signals go to the PA (U1203), and then switches to the ANT port, and
finally to the antenna unit.
The FDD TX circuit includes LTE B2/B3/B4/B5/B7/B12/B13/B17/B26/B28 and W-CDMA B2/B4/B5.
TDD TX Circuit
The original TDD RF signal transmitted by the Transceiver (U1600) goes to the PA (U1401) for
amplification, and then to the Filter for filtering. Afterwards, the filtered signal goes to the PA (U1203), and
then switches to the ANT port, and finally to the antenna unit.
The TDD TX circuit includes LTE B38.
5.1.2.3 Main RX Circuit
FDD RX Circuit
The FDD RF signal from the antenna goes to the ANT port of the PA (U1203), the TRX port, and then the
DUP for filtering. The filtered signal goes to the switch for channel switching, and then to the main receiving
interface of the Transceiver (U1600).
The FDD RX circuit includes LTE B2/B3/B4/B5/B7/B12/B13/B17/B26/B28 and W-CDMA B2/B4/B5. The
GSM RX circuit and the FDD RX circuit have the same channel.
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