Transmitter (Tx) - Nokia 2608 Service Manual

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An tenna
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Transmitter (TX)

The RF transmitter i s b
innovations. It provid the zero-IF transmit s es
0 within the CDMA2 0 standard (Tx bands 00
amplifiers, quadratu re
secondary T functio x ns
VCO ircuit, T LO gen ation and distribution c x er
Page 5-32
Coupler
Duplexer
T Loop Fi ter X
RX Loop Filt
F igure 2 RX System block diag
ased upon the well-e
upco version, gain co rol RF amplification, n
are integrate as wel d l: a
Company Confidential
Copyright © 2008 Nokia. All rights reserved.
PA
Power
detector
l
er
8
sta blished RFT6122 IC
ign al pa h for ce lular-CD t l
of 824 to 849 MHz). The trans it signal path
nt
reference for the tran
cir cuits, and various inte ce, control, and status
System Module and User Interface
TX Filter
QSC6020
Cell Ba nd
RX SA W
ram
des ign, ut imp oved to clude the latest b r
MA transmission as defi
m
an d an output driver am lifier. Numerous
sm it DA s, the T phase- C x
rfa
RM-376
in
ned by band class
inc ludes baseband
p
loc ked loop, the Tx
cir cuits.
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