Nokia 2650 サービスマニュアル

 RH-53/54

Nokia Customer Care

8-System Module

36

COMPANY CONFIDENTIAL

ISSUE 1 09/2004

Copyright © 2004 Nokia. All Rights Reserved.

■ 

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 functionality of 
the RF Engine. The ASIC contains RX and TX functions, VCXO (crystal is placed external to 
the ASIC), se the block diagram.

■ 

The VCXO is an on-chip oscillator with off-chip crystal with a frequency of 26 MHz. 

The VCO used is a quad band which covers the neaded frequency range for both 900/1800 
and 850/1900.

INPL

INML

INPM

INMM

OUTHP
OUTHM

OUTLP
OUTLM

RXQP

RXIP

DET

RBE

X

T

VB_DET

VANTL

TXC

TXP

V

D

D

R

X

B

B

VTXLOL

VBEXT

VRX

INPH

INMH

T

X

IP/TXIM

TX

Q

P

/T

X

Q

M

2

2

RXIM

RXQM

PLFB1
PLFB2

VPCTRL_G

VPLL

VDDCP

VDDPRE

VDDLO

VDDPLL

VR

EF1

VBB (1.8V)

VTX

2,7k

Vcp

supply

filter

SEN

S

E

RESETX

VD

DT

X

Supply

filter

Ref.
filter

3

RFBUSX
RFBUSDA
RFBUSCLK

Synth

supply

filter

Rx

supply

filter

VC

OSEN

SE

VTXBH

VTXBL

VANTM

VTXLOH

SELADDR

Vio:

VDDDL, SELADDR

Vr2:

VTX, VDDTX, VDDDIG

Vr3:

VDDXO, VDDBBB

Vr4:

Not used

Vr5:

VDDLO, VDDPLL, VDDPRE

Vr6:

VDDRXBB, VDDRXF

Vr7:

VVCO

VR1A:

VDDCP

SAW

VBATTRF

PCN/PCS

GSM

PW-
loop
filter

SAW

VTX

RX900

Balun

SAW

RX1800/
1900

64/65

NDIV
ADIV

ϕ

Charge

Pump

RDIV

1/2

1/4

2

2

2

2

1/2

1/4

Open collector

Open collector

LPF1

DCN1

PWC

RF

Controls

RF

Controls

BBAMP

BBAMP

1/2

Buffer

AGC

Lock

Detect

2

2

2

2

LPF2

LPF1

DCN1

AGC

LPF2

V

D

D

R

X

F

Digital Control

  BIQUAD

  BIQUAD

DCN2

DCN2

LNA

LNA

LNA

Pre-gain

Pre-gain

VDDDIG

Main Bias Circuit

Resistor Ext/R2H/R2

VDDRXBB

Sensor

BIST / Temp.

VD

DT

X

LNA
Bias

VDDRXBB

Buf/

AGC

VCXO Bias

R2H/R2

AFC/CAL

Control

RESETX

3

VD

DR

XBB

26MHz

VXO

RF_EN
RF_CLK
RF_DATA

XTALM

XTALP

REFOUT

VDDXO

VDDBBB

INPLO

INMLO

REF CLK SET

VCXO
supply

filter

CPOUT

PLL
loop
filter

REFOUT

RESET_X_M

VANTH

VCO

supply

filter

VD

DD

IG

VD

DD

L

VBEXT

I/O level

shift

VDDXO

SEL

A

D

D

R

Rpa

18 K : Vendor 1
47 K : Vendor 2
82 K : Vendor 3

Diplexer

RX/TX switch

PA and detector

Ant

GSM RX

PCS RX

TX/RX GSM

TX/RX DCS

Band sel

VTX

PCN/PCS

V

apc

Vs

e

n

s

e