SIEMENS EL71 Schematics 3

EL71 RF Diagram

a

antenna

matching

external antennainternal antenna

mechanical
antenna
switch

FEM

Hitachi

HWXQ411/413

2

2

2

RF_FE_CTR_GSM

RF_FE_CTR_DCS

GSM LNA

2

DCS LNA

2

PCS LNA

2

RF PLL

CP

PFD

26MHz

R

D

IQ Demodulator

1

2

IQ Demodulator

1

2

1/2

RF VCO

3476-3980MHz

1

1

postfilter postfilter

external
RF loopfilter

I Channel

Q Channel

integr.

GSM 1/4

XCS 1/2

IF PLL

CP

PFD

26MHz

R

D

DC autocalibration

1

1

external
IF loopfilter

integr.

IF VCO

640-656MHz

1/2

26MHz

26MHz
VCXO

26MHz
to Power Asic

26MHz
to Baseband

26MHz
to Bluetooth

26MHz
Crystal

BATT+

VDD_RF1

VDD_RF2

RF_BAND_SW

RF_FE_CTR_GSM

RF_FE_CTR_DCS

PM_SIN26M

BB_SIN26M

PF_SIN26M

RF_AFC

TVCXO

PA
Agilent
QCPM8861

DIRCOUPLER

DIRCOUPLER

TXLO

TX_ON

LDO

BATT+

PARAMP

Sub loop

down converter

1/2

850/900 MHz

RF_BAND_SW

integr.

1800/1900 MHz

TXVCOs

postfilter

external

PM loo pf i lter

PM Detectors

DPD

APD

GMSK
EDGE

State

machine

Serial

Interface

IQ Modulator

RF_STR

RF_DAT

RF_CLK

RF_QX

RF_Q

RF_I

RF_IX

1

2

Baseband

AM Detectors

VIC

postfilter

VID

external

AM loopfilter

ATT

&

Combiner

50R

ATT

TXLO

Main loo p
down converter

Gain contro ller

RF_RAMP1

Transceiver IC

Renesas HD155 153