User Guide

CCS Technical Documentation System Module
RH-25
Issue 1 10/2003 ©Nokia Corporation Confidential Page 29
RF Functional Description
Block diagram
Figure 19: Block diagram of the RH-25 RF module
VR 2 VR 3 VR 4 VR 5 VR 6 VR 7
VR 1
2.78V 2.78V 2.78V 2.78V 2.78V
2.78V
4.7V
IPA1&2
VFlash1
0...5mA
2.78V
VBatt
RFConv
RFAuxConv
RFRegs
A
VR 1
4.7VB
VIO
PURX
PDMid
135.54MHz IF Filters
CLK
DATA
EN A
TXP1
2
+6dBm
DIV 2
I
I
Q
RH-25 RF
RX
Rx
VCO
CONTROL
REGS
GEN I/O
Serial IF
PURX
2X D AC
8 bi t
OFFSET
CONTR.
AFC
BIAS
CONT
VR 4
VR 4
VR 4
VR4
VR 4
VR 4
VR 4 VR 4
VR 4VR 4
VR4
VR 4
VR 4
VFlash1
DIV 2
VR 7
VR 7
VR2
VR2
VRef1
(VR 3)
DIV 2
PHASE
DET.
UHF - PLL
PHASE
DET.
VHF - PLL Tx
361.08 MHz
ANT
Q
TXPWRDet
TX
RX
TX
-T
L
H
IPA2
IPA1
DE T.
L
H
PHASE
DET.
VHF - PLL
Rx
271.08 MHz
TXP2 TXP1
Tx
VC O
PATemp
VR 7
VR 7
Presc.
VR 7
VR 1B
VR 7
VR 1A
VR 7
VR 2
VR2
VR2
VR2
VR3
VR2
VBatt
VBatt
VR 3
VCTCXO
19.44 MHz
+18dB 4th Chbv -6 ... +36dB
TDMA Low:
869.01 ... 893.97
-20dB @
f
O
+-60kHz
f
L
=14k TDMA
I & Q fixe d
Gain +24dB
I & Q va ri ab l e G ai n
-6 ... +36dB
7 steps of 6dB
+8dB
LNAL
LNAH
+ 1 5/ 0d B
+16/-4dB
@U
RF
</> 70dBm
VR2
+5dBm
0 ... 5mA
-44 ... +12dB
step 4dB
VR5
+30dBm
VR6
+30dB m
+28dBm
@Tx lvl2
+8dB
HIGH
BAND
LOW
BAND
222
2
2
2
2
2008...2125 MHz
VFLASF1/VR7
VR 4
VR 4
2
VR2
RF
TDMA
180.54MHz
VFLASF1/VR7
VFLA SF1/VR7
VR 7
2
2
TDMA
UHF
VCO