3 GSM Frequency & Frame structure MHz124 channels (200 kHz)downlink- BW = 25MHz- Channel space =200KHz- Channel No = /20000= 125 Chnnel- 8 user share 200KHz- 200 KHz time period = 4.615msms/8user = 577us- One user occupies CH for 577usfrequencyMHz124 channels (200 kHz)uplinkhigher GSM frame structurestimeGSM TDMA frame123456784.615 msGSM time-slot (normal burst)guardspaceguardspacetailuser dataSTrainingSuser datatail3 bits57 bits126 bits157 bits3546.5 µs577 µs
4 Advanced Material On TECHnology ASM & FEMAdvanced Material On TECHnology
5 Miniaturization demand of mobile phone is increasing What is ASM, FEM?Miniaturization demand of mobile phone is increasingHandset components ( Passive : Active = 75% : 25% )To achieve multifuncion and miniaturizaion , handset need smaller moduleSwitching and filtering could be easily integrated into one moduleASM (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 phoneASM 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
7 Amotech ASM, FEM feature Very low Insertion Loss in TX, RX.- We guarantee TX I/L under -0.8dB of ASM.- We have good Output of Power through ASM from PAM.Very Stable and Flat Ripple in TX Bandwidth.- We keep Power Level stable among Low, Middle, High level.Good Attenuation in 2f0,3f0.- 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
8 Amotech product line up 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 .6750 : AMFT5440 : AMFT6750 : AMFD5440 : AMAT5440 : AMAD4532 : AMADDual Band ASMDual Band FEMTriple Band FEMTriple Band ASM
9 Market trend > Current main size (5440, 4532 for Dual ASM) 6750 →5440 → 4532 → 3216Main sizefor current market(5440, 4532)6.7mm5.0mm4.0mm3.2mm5.4mm1.6mm4.5mm3.2mm> 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.
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