User Guide

Nokia Customer Care System Module
RH-37
Issue 1 07/04 Nokia Corporation Page 55
The differential base band amplifiers are internally DC-coupled. Their common mode lev-
els are set equal to the external reference voltage VrefRF01. The base band outputs RXIP
and RXQP are single-ended and connected directly to the differential ADC inputs
(RXI◊RXIINP and RXQ◊RXQINP) of the UEM-ASIC. Its common mode level is set equal to
the external reference voltage VrefRF02.
Transmitter signal paths
The baseband I and Q signals, coming from UEM, are mixed up to the transmitting fre-
quency in the RF ASIC.
The low band signal passes a SAW band filter to suppress unwanted noise. Additionally,
the SAW filter converts the balanced output signal of the RF ASIC to a single-ended sig-
nal for the power amplifier input.
The high band signal does not require a SAW filter, therefore it passes a balun to convert
mat chi ng
1800/1900
internal
mat chi ng
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
INTEGR ATED
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- en d Modu le
ESD
HB BP
LC
900 Tx
LC
LC
1900 Tx
LC
TXQM
TXQP
TXIP
TXIM
TXA
SCLK
SLE
SDATA
RESET
CTRL i nputs
Vtxb 850/900Iref 850/900Iref 1800/1900Vdetect 850/900Vdetect 1800/1900 Vpctrl 850/900V pct rl 18 00/190 0 Vmode
REFCLK
AFC D/A
TXP
VDIG
VRF_RXVLNA
RFTEMP
Analog AGC
Analog AGC
Vtxb 1800/1900
Helgo
MODE
Ire f 18 00/1 900
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