GSM (Global System for Mobile communication ) GSM.

GSM GSM

(Global System (Global System forfor Mobile Mobile communicationcommunication))

GSM GSM

(Global System (Global System forfor Mobile Mobile communicationcommunication))

1000900 1100 1200 1300 1400 1500 1600 1800 19001700 2000

GSM 900Tx Rx

DCS 1800Tx Rx

PCS 1900Tx Rx

MHz

Dual Band

Triple Band

GSM Frequency Allocation Table

Band Tx Fc Rx Fc BW

GSM 850 824 ~ 849 836.5 869 ~ 894 881.5 25M

GSM 900 Phase 1 890 ~ 915 902.5 935 ~ 960 947.5 25M

Phase 2(EGSM)

880 ~ 915 897.5 925 ~ 960 942.5 35M

DCS 1800

1710 ~ 1785

1747.5

1805 ~ 1880

1842.5

75M

PCS 1900

1850 ~ 1910

1880 1930 ~ 1990

1960 60M

1 2 3 4 5 6 7 8

higher GSM frame structures

935-960 MHz124 channels (200 kHz)downlink

890-915 MHz124 channels (200 kHz)uplink

frequ

ency

time

GSM TDMA frame

GSM time-slot (normal burst)

4.615 ms

546.5 µs577 µs

tail user data TrainingSguardspace S user data tail

guardspace

3 bits 57 bits 26 bits 57 bits1 1 3

- BW = 25MHz

- Channel space =200KHz

- Channel No = 25000000/20000 = 125 Chnnel

- 8 user share 200KHz

- 200 KHz time period = 4.615ms

- 4.615ms/8user = 577us- One user occupies CH for 577us

GSM Frequency & Frame structure

4

ASM & FEMASM & FEMASM & FEMASM & FEM

Advanced Material On TECHnology

What is ASM, FEM?

ASM (Antenna Switch Module) Because using TDMA to share time for 577us in 200KHz , GSM phone can use switch module. A few ceramic duplexer and filter can implement same function of ASM, but using ASM is cheaper than duplexer. ASM enable small sized multifunctional mobile phone ASM function - Diplexer function ( Divide the frequency band of GSM900 and DCS1800) - Duplexer function ( Divide Tx, Rx signal for each GSM900 and DCS1800) - Tx LPF function (Tx LPF for each GSM900 and DCS1800)

FEM (Front End Module) > In addition to ASM, FEM includes Rx SAW filter > With integrating SAW to ASM, it is easier to make phone small size. > SAW filter function : In-band Rx signal can pass through with SAW filter

Miniaturization demand of mobile phone is increasingHandset components ( Passive : Active = 75% : 25% )To achieve multifuncion and miniaturizaion , handset need smaller module Switching and filtering could be easily integrated into one module

Mobile handset block diagram

LP F

LP F

SAWFilter

Interstage

F ilter

LCBP F

LCBP F

P D

LP F

I/ QMod

LP F

IFP LL

MatchingC ircuit

IFSAW

Matc ingC ircuit I/ Q

Demod

LCF ilter

RFP LL

SAWF ilter

LNA

LNAInterstage

F ilter

Mixer

Mixer

IFAGC

P AM

P AM

VC O

VC OTX/ IFVC O

13MHZTC XO

RX/ IFVC OTRx/ RF

VC O

Mixer

I

Q

I

Q

B/ B

Dip

lexe

r

DC S1800Tx/ Rx Switch

G SM900Tx/ Rx Switch

ASM

FEM

Tx

Rx

Tx

Rx

GSM 900 Tx

GSM 900 Rx

DCS1800 Tx

DCS1800 Rx

Amotech ASM, FEM feature

Very low Insertion Loss in TX, RX.Very low Insertion Loss in TX, RX.

- - We guarantee TX I/L under -0.8dB of ASM.We guarantee TX I/L under -0.8dB of ASM.

- We have good Output of Power through ASM from PAM- We have good Output of Power through ASM from PAM. .

Very Stable and Flat Ripple in TX Bandwidth.Very Stable and Flat Ripple in TX Bandwidth.

- We keep Power Level stable among Low, Middle, High level.- We keep Power Level stable among Low, Middle, High level.

Good Attenuation in 2f0,3f0.Good Attenuation in 2f0,3f0.

- We give better Harmonics in 2f0, and 3f0.- We give better Harmonics in 2f0, and 3f0. Better Stabilization on ESD Testing. - We produce FEM embedded with Varistor. Good TX and RX Isolation. Perfect Engineering Support and Competitive Pricing

Amotech product line up

6750 : AMFT6750-01 5440 : AMFT5440-01

6750 : AMFD6750-01

5440 : AMAT5440-01

5440 : AMAD5440-01 4532 : AMAD4532-01

Dual Band ASMDual Band ASM Dual Band FEMDual Band FEM

Triple Band FEMTriple Band FEMTriple Band ASMTriple Band ASM

AMOTECH’S LTCC modules of ASM & FEM, ranging from 4532 dual band to 6750 triple band which

have stable electrical characters, can keep mobile phone function good in TX,RX .

6.7mm

5.0mm

5.4mm

4.0mm

4.5mm

3.2mm

1.6mm

3.2m

m

6750 →→5440 →→ 4532 →→ 3216 6750 →→5440 →→ 4532 →→ 3216

Market trend

Main size for current market

(5440, 4532)

> Current main size (5440, 4532 for Dual ASM) > Big trends are FEM will replace ASM. > ASM + SAW is more expensive than FEM > But, many engineers still like to use ASM, due to incredibility of FEM. > SAMSUNG use ASM, 50% , and FEM, 50% for their GSM phone. > Market situation is different depending on each country and mobile manufacturer.

Components of ASM,FEM

Diplexer 1EA

Diode Switch 2EA

LPF 2EA

Dual ASM

DIPLEXER, DIODE, LPF, SAW, VARISTOR DIPLEXER, DIODE, LPF, SAW, VARISTOR

Diplexer 1EA

Diode Switch 2EA

LPF 2EA

SAW Filter 2EA

Diplexer 1EA

Diode Switch 2EA

LPF 2EA

SAW Filter 2EA

Varistor 1EA~4EA

Dual FEM Dual FEM with varisotr

Block Diagram

Dual band ASM

Triple band ASM

Dual band FEM

LP F

LP F DC S/ P C S Tx

EGSM Tx

DC S Rx

P C S Rx

EGSM Rx

Diplexer

Switch

Switch

Switch

DC S Tx

EGSM Tx

DC S Rx 1

DC S Rx 2

Diplexer

Switch

Switch

LPF

SAW

SAW

LPF

EGSM Rx 1

EGSM Rx 2

DC S Tx

EG SM Tx

DC S Rx

Diplexer

Switch

Switch

LP F

LP F

EG SM Rx

Dimension

Terminal No. Terminal Name

① DCS-Rx

② VC2

③ DCS-Tx

④ GND

⑤ EGSM-Tx

⑥ GND

⑦ ANT

⑧ GND

⑨ EGSM-Rx

⑩ VC1

⑪ GND

⑫ GND

Pin Layout

Ex) Dual band ASM

Control VoltageMIN TYP MAX

2.5 2.7 2.9

Mode VC1 VC2 Current

ANT → EGSM Rx 0V 0V < 0.1mA

ANT → DCS Rx 0V 0V < 0.1mA

EGSM Tx → ANT 2.7 V 0V 10mA

DCS Tx → ANT 0V 2.7 V 10mA

Test Circuit

Control Voltage & Current

Ex) Dual band ASM

GSM 900 DCS1800

mode Parameter unit Min Max Min Max

Rx

Frequency Range MHz 925 960 1805 1880

Insertion Loss

at 25℃ dB 0.85 max 1.00 max

at -30~+85℃ dB 1.00 max 1.10 max

Return Loss dB 15.0 min 15.0 min

Tx

Frequency Range MHz 880 915 1710 1785

Insertion Loss

at 25℃ dB 1.30 max. 1.30 max.

at -30~+85℃ dB 1.40 max. 1.40 max.

Attenuation

2 X fgt dB 30.0 min 25.0 min

3 X fgt dB 25.0 min 25.0 min

　 　 　 25.0 min

Isolation Tx - Rx dB 20.0 min. 20.0 min.

Return Loss 　 dB 12.0 min 12.0 min

Current Consumption 　 mA 10.0 max. 10.0 max.

Permissible input Power

dBm +35.0 peak +33.0 peak

Electrical specification

Ex) Dual band ASM

S11,S21 graph

1 2 3 4 50 6

-40

-30

-20

-10

0

-50

10

freq, GHz

dB

(S(2

,1))

dB

(S(1

,1))

1 2 3 4 50 6

-40

-30

-20

-10

0

-50

10

freq, GHz

dB

(S(1

,1))

dB

(S(2

,1))

1 2 3 4 50 6

-40

-30

-20

-10

0

-50

10

freq, GHz

dB

(S(1

,1))

dB

(S(2

,1))

1 2 3 4 50 6

-40

-30

-20

-10

0

-50

10

freq, GHzdB

(S(7

,8))

dB

(S(8

,8))

GSM Rx GSM Tx

DCS Rx DCS Tx

Ex) Dual band ASM

Smith chartm3freq=942.0MHzS(1,1)=0.106 / 112.883impedance = Z0 * (0.904 + j0.178)

freq (0.0000 Hz to 6.000GHz)

S(1

,1)

m3

m1freq=1.842GHzS(1,1)=0.051 / 31.779impedance = Z0 * (1.090 + j0.059)

freq (0.0000 Hz to 6.000GHz)

S(1

,1) m1

m23freq=1.747GHzS(8,8)=0.089 / 58.971impedance = Z0 * (1.083 + j0.167)

freq (0.0000 Hz to 6.000GHz)

S(8

,8)

m23

m1freq=897.0MHzS(1,1)=0.069 / 1.035impedance = Z0 * (1.148 + j0.003)

freq (0.0000 Hz to 6.000GHz)

S(1

,1) m1

GSM RxGSM Tx

DCS Rx DCS Tx

Ex) Dual band ASM