Nokia RM-243 - RF Description; Block Diagram; Receiver (RX)

Table 19 Back-up battery electrical characteristics
Description Parameter Min Typ Max Unit
Back-Up
Battery
Voltage
Vback 0 2.6 3.3 V
RF description
Block diagram
Figure 51 RF block diagram using RF ASIC N7505
The RF block diagram uses RF ASIC N7505 that performs the RF back-end functions of receive and transmit
function of the cellular transceiver.
Receiver (RX)
An analogue signal is received by the phone's antenna. The signal is converted to a digital signal and is then
transferred further to the baseband (eg. to the earpiece).
The receiver functions are implemented in the RF ASIC.
Signals with different frequencies take different "ways", being handled by different components. The
principle of GSM and WCDMA is the same.
RM-243
System Module and User Interface
Issue 1 COMPANY CONFIDENTIAL Page 6 –25
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