Cellular Rf Technical Description; Rf Block; Qubbe; Receiver (Rx) - Nokia RM-626 Service Manual

RM-626
System Module
The AVVideoControl signal handles microphone usage of the AV connector. The plug detection signal handles
the AV connector plug detection with HeadDet signal from EM ASIC.

Cellular RF technical description

RF block

Linko RF consists of the following key components:
• Älli (Transceiver RF Asic)
• Aura (RF power management Asic)
• Ukko PA
• QuBBE (Front end module)
Figure 67 Linko RF block diagram
The RF block uses RF ASIC N7512 that performs the RF back-end functions of receive and transmit function of
the cellular transceiver.

QuBBE

The front end module called QuBBE contains the needed front end filters and the switches. QuBBE contains:
• 3 duplexers (Band II, V, VIII)
• 1 triplexer (Band I, IV)
• 12 switches with the control
• Low and high band GSM TX low bass filters
• 50 ohms low and high and antenna interface
The control signals for the switches come from Älli.

Receiver (RX)

Linko RF has higher integration level compared to previous RF generations and especially more digital design
blocks have been integrated to Älli, RF Asic.
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