Nokia 6020b Service Manual
RM-31
Nokia Customer Care
7 - System Module
48
COMPANY CONFIDENTIAL
Issue 1 03/2005
Copyright © 2005 Nokia. All Rights Reserved.
Figure 18: RF block diagram
A detailed functional description is given in the following sections.
■
Antenna switch (TX/RX switch)
The antenna switch operates as a diplexer for the RX and TX signals. The antenna switch is
controlled by the RF ASIC using the control signals VANT1, VANT2 and VANT3.
controlled by the RF ASIC using the control signals VANT1, VANT2 and VANT3.
The table below shows the possible different switching states.
matching
1800/1900
internal
matching
internal
800/900
sensor
temp
gen
bias
by two
Divide
network
feedback
detector
LB LP
FILTER
Balun
PA Detect
VDIG
VDIG
900 Tx
VR3
VCTCXO Module
SAW
VCO Module
VR7
EGSM
2 dB
Att
Balun
900 Rx
SAW
1800 Rx
SAW
BUILT-IN DC COMP.
AND AGC FUNCTION
LOW-PASS FILTERS
INTEGRATED
VBB
VDIG
1900 Rx
SAW
Balun
3dB att
3dB att
GPIO
10/40mA
2.7V
VBB
Det.
GPIO
10mA
2.7V
s1
s2
Det.
Edge capable PA Module
Digital AGC
Digital AGC
Pull-up
Network
VLO
by 2/4
Divide
VPRE,VDIG,VCP
EGSM
PLL
Serial
Bi-directional
Interface
RF Front-end Module
ESD
HB BP
LC
900 Tx
LC
LC
1900 Tx
LC
TXQM
TXQP
TXIP
TXIM
TXA
SCLK
SLE
SDATA
RESET
CTRL inputs
Vtxb 850/900
Iref 850/900
Iref 1800/1900
Vdetect 850/900
Vdetect 1800/1900
Vpctrl 850/900
Vpctrl 1800/1900
Vmode
REFCLK
AFC D/A
TXP
VDIG
VRF_RX
VLNA
RFTEMP
Analog AGC
Analog AGC
Vtxb 1800/1900
Helgo
MODE
Iref 1800/1900
Iref 850/900
PA ID
s7
GMSK Feed-back
s3
s5
PCTRL enable
VRF_TX,VBB,VLO,VTX
s6
8-PSK Feed-back
Digital AGC
Digital AGC
VPAB,VBB
VBB, GND_BB
RXIP
RXQP
VF_RX
1k2
VCP
VR1
VR2
VRF_TX
VBAT
LNAB_P
LNA_P
VDIG
VR3
VF_RX
VPAB_VLNA
VRF_RX
VR4
VLO
VPRE
VR5
VBB
VR6
TXC
V_ref_RF01
R_ref
RB_ext
VB_ext
Helgo