Cellular Rf Technical Description; He Wtr1605L Transceiver Unit Could Support Gsm/Egprs/Wcdma/Hspa+/Lte - Nokia Lumia 1320 Service Manual

RM-994/ RM-995/ RM-996
System Module

Cellular RF technical description

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The WTR1605L transceiver unit could support GSM/EGPRS/WCDMA/HSPA+/LTE
Receiver (RX)
An analogue signal is received by phone's antenna. The signal is converted to a digital signal and then
transferred further to the baseband (e.g. to the earpiece).
The receiver functions are implemented in the WTR1605L RF block. Signals at different frequencies goes
different path, and are therefore is processed by different components.
Transmitter (TX)
The digital baseband signal (e.g. from the microphone) is converted to an analogue signal, which is then
amplified by amplifier and transmitted from the antenna. The frequency of this signal can be tuned to match
the bandwidth of the system in use (e.g. WCDMA Band1 band).
The transmitter functions are implemented in the WTR1605L RF block. Even though WCDMA Band1
signals are sent via different components, the principles of the transmission are the same.
Figure 55 WTR1605(L) System Module
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