Functional Descriptions; Rf Block Diagram; Frequency Synthesizers; Fig 27 Power Distribution Diagram - Nokia RH-9 Series Ccs Technical Documentation

CCS Technical Documentation

Functional descriptions

RF block diagram

Block diagrams of direct conversion receiver and transmitter RF section has described in
the following figure.
The architecture is based on Mjoelner, the RF ASIC, which contains most of the function-
ality of the RF Engine. The ASIC contains RX and TX functions, VCXO (crystal is placed
external to the ASIC), se the block diagram.
INPL
SAW
RX900
RX
INML
GSM
SAW
TX
INPM
RX RX1800
INMM
PCN
INPH
TX
RX1900
INMH
VANT1 / VANT2
2
VTXBL VTXBH
VTXLOL
PCN OUTHP
Dir. Coupler SAW
OUTHM
PA
VTX
SAW
OUTLP
OUTLM
EGSM
DET
PW-
PLFB1
DET loop
PLFB2
Filter
VBATT

Frequency synthesizers

VCXO
The VCXO is an on-chip oscillator with off-chip crystal. The oscillator in itself is balanced
with two independent outputs. One output is used inside the ASIC as reference for the
PLL. The second output is for the baseband, an output which can be filtered inside the
ASIC, controlled by SW. The reference frequency is 26 MHz in order to ease the suppres-
sion of the reference spurious.
The drive level of the crystal can be adjusted by software control, also the frequency
accuracy is controlled by software with a digital frequency inputs. The digital frequency
control is divided between calibration and AFC.
VCO
The VCO is module containing all the frequency determining parts inside. The VCO covers
Issue 1 11/02
Figure 28: Block Schematic
2 2 2
2
1/2 1/4
1/2 1/4
RF
Controls
2
2 2
RF
2
Controls
2 2 2 2
Open
collector
Open
collector
PWC
VPCH/VPCL
2
ãNokia Corporation
Mjoelner
DCN1 AGC
BBAMP
LPF1
DCN1 AGC
BBAMP
LPF1
ϕ
NDIV
64/65
ADIV
LOCNT
RDIV
REFCNT
LO
buffer
CTRL
SENSE
Hitachi PA: 18k
RFMD PA: 82k
RH-9
System Module & UI
VRX
RBEXT
2,7k
BIQUAD
DCN2
LPF2
BIQUAD
DCN2
LPF2
VPLL
VDDPLL
VDDLO
VDDPRE
VCP
VDDCP
charge
CPOUT
loop
pump
filter
VVCO
Lock
detect
VXO
VDDXO
REFOU
REFOUT
Buffer T
XTALM
26MHz
XTALP
VCCVCO1
VCCVCO2
VDDBBB
VBB
VDDDL
VDDDIG
TXIP/TXIM
2
TXQP/TXQM
2
VBEXT VREF1
RESETX RESET_X
RFBUSCLK
3
RFBUSX
RFBUSDA
VTX
TXC
TXP
Page 77
RXIP
RXIM
RXQP
RXQM