Rf Description; Block Diagram; Receiver (Rx) - Nokia 2608 Service Manual

RM-376
System Module and User Interface

RF Description

Block diagram

Ant enna
An tenna
FEM

Receiver (RX)

The RF receiver is bas ed
zero-IF receive signa l pa
includes the LNA, qua ature downc nverter dr
converters (ADCs). Nu erous secondary Rx fu tions are integrated a m
generation and distr ibu
statu circuit s s.
Issue1
Coupler
Duplexer
TX Loop F er ilt
RX Loop Filt
Figure 27 RF B
upon the RFR6122 IC de
th also supports band lass 0 (Rx bands of 869
o , an
nc
tion ircuits, reference c
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PA
Power
detector
er
lock diagram using Q 6020
sign, but includes sig
c
alog baseba d filters n
an d clock circuits for th
TX Filter
QSC6020
Cell Band
RX SAW
SC
nifi cant nnovative impro ments. This i
to 894 MHz). The receiv ignal path
an d buffers, and analog
s w ell: the Rx PLL , the Rx
e A DCs, a d vario s inter n u
ve
e s
-to-digit al
VC O circuit, Rx LO
fac e, control, and
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