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