Receiver (Rx) - Nokia 6500 SLIDE RM-240 Service Manual

RM-240
System Module
Figure 27 FM interface
The FM radio is an integrated circuit, controlled by MCU software through a serial bus interface. The wires of
the headset are used as poles of the antenna, and no other antenna is needed for FM radio reception.
In addition to the Bluetooth unit the FM radio is provided with LDO (low drop out) voltage 2V8_FM_LCD.
The radio has an automatic band search function, which can search for a strong write/read signal from a
certain frequency. When this is found, data is transmitted to the radio. When the signal strength is low, the
EM ASIC N2200 (AVILMA) can read data, which is available until the signal is strong again.

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 paths, therefore being handled by different components.
The principle of GSM and WCDMA is the same.
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