User Guide
System Module LG4 and Grip Module LS4 CCS Technical Documentation
Page 34 ¤Nokia Corporation Issue 2 11/02
RF Module
Functional block descriptions
The block diagrams of direct-conversion receiver and transmitter RF section are
described in the following figure. The illustration shows the RF-IC ( both RX and TX
functions ), power amplifier ( PA ), TX-SAW filter, VCO, VCTCXO module, discrete LNA
stages and SAW-filters for receive bands.
Figure 19: RF block description
The Frequency synthesizer
The VCO frequency is locked using a PLL to a stable frequency source, which is a VCTCXO.
The VCTCXO is running at 26 MHz. The Temperature effect is controlled with AFC. The
AFC is generated with a 11 bit conventional DAC in UEM.
The physical PLL is located inside the HAGAR RF-IC and is controlled via serial bus. The
PLL synthesizer consists of the following blocks :
• 64/65 CML prescaler
• Programable R-, N- and A-dividers,
• Phase detector and charge pump
64/65
NDIV
ADIV
M
charge
pump
RDIV
SDATA
SCLK
SLE
1/4
1/2
2
OSC_IN
OUT_CP
2
222
1/2
1/4
2
2
44
44
TXI_0/TXI_180
DET
loop
filter
VCO
AFC
INP_P_RX
INM_P_RX
Antenna switch
RX
RX
TX
TX
INP_G_RX
INM_G_RX
OUTP_P_TX
OUTP_G_TX
DCN2
DCN2
RX Filter
Calibration
2
2 2
2
TXQ_0/TXQ_180
LNA_P
RXQ
RXI
OUT_BB1_I
OUT_BB1_Q
I_DCN2_I
I_DCN2_Q
C1_BB1_I
C2_BB1_I
C2_BB1_Q
C1_BB1_Q
Cp_f_I
Cm_f_I
Cp_f_Q
Cm_f_Q
Cp_dtos_I
Cm_dtos_I
Cp_dtos_Q
Cm_dtos_Q
Last edit 12:39 13.12.00
Drawing85
Open co llec tor
Open co llec tor
0-40dB
BB_Gain
0-40dB
BB_Gain
DtoS
DtoS
BIQ UAD
BIQ UAD
E-GSM
900
GSM
1800
VRF_RX
VBATTRF
VDIG
VPRE
VCP/GND_CP
2
VLO
Reset
RF TEMP
SENSOR
RFTEMP
PWC
DET
TXP
TXC
Vpct rl_fb
Vpctrl_g
Vpctrl_p
INP_LO/INM_LO
GNDRF_TX
VBB
VREF_RX
VB_EXT
RB_EXT
VB_DET
LNA_G
V_ANT_1/
V_ANT_2
2
RFCLK
VR3
8 / 18 dB
8 / 18 dB
1/2
TOUT
0dB
SAW
SAW
Dir. Coupler
HAGAR
VR4
VR7
VREFRF02
VREFRF01
RXI_P
RXQ_P
VR5
AFC
RESET
RFBUSEN1
RFBUSCLK
RFBUSDA
TXC
TXP
VBATTRF
TXQ_0/TXQ_180
TXI_0/TXI_180
2
2
HGR_TEMP
VR2
VR1
GND_BB / GND RF_RX / GND_LO / GND_PRE /
GND_CP / GN D_DIG / GN D_RX
VF_RX
LNAB_G
3dB
2
VTX_B_G
VTX_B_P
VtxB_DCS
VtxB_GSM
OUTM_G_TX
OUTM_P_TX
SAW
LNA
LNA
LNAB_P
RF
Controls
RXQ_N
RXI_N
LPRF CLK
26MHz
VR6
PA
VtxLO_GSM
VTXLO_G
CTRL
SAW
dB
-2
dB
-2