Bluetooth; Rf Description; Receiver (Rx); Transmitter (Tx) - Nokia RM-801 Service Manual

RM-801; RM-819(Nokia Lumia 800)
System Module

Bluetooth

The CSR chip Blue Core 6-ROM WLCSP is a single-chip radio and baseband IC for Bluetooth 2.4GHz systems
including enhanced data rate(EDR) to 3Mbps. With the on-chip CSR Bluetooth software stack, it provides a fully
compliant Bluetooth v2.1+ EDR specification system for data and voice communications.

RF description



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 QTR8215 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. WCDMABand1 band).
The transmitter functions are implemented in the QTR8215 RF block. Even though WCDMA Band1 signals are sent
via different components, the principles of the transmission are the same.
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