12 3 4 5 6 78 higher GSM frame structures 935-960 MHz 124 channels (200 kHz) downlink 890-915 MHz 124 channels (200 kHz) uplink frequency time GSM TDMA frame GSM time-slot (normal burst) 4.615 ms 546.5 µs 577 µs tailuser dataTrainingS guard space Suser datatail guard space 3 bits57 bits26 bits 57 bits1 13 - 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 & FEM A dvanced M aterial O n TECH nology
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 increasing Handset components ( Passive : Active = 75% : 25% ) To achieve multifuncion and miniaturizaion, handset need smaller module Switching and filtering could be easily integrated into one module
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. - 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. - 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 ASM Dual Band FEM Triple Band FEM Triple Band ASM AMOTECHS 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 3.2mm 67505440 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.
Block Diagram Dual band ASM Triple band ASM Dual band FEM
Dimension Terminal No.Terminal Name DCS-Rx VC2 DCS-Tx GND EGSM-Tx GND ANT GND EGSM-Rx VC1 GND GND Pin Layout Ex) Dual band ASM
Control Voltage MINTYPMAX 220.127.116.11 ModeVC1VC2Current ANT EGSM Rx0V < 0.1mA ANT DCS Rx0V < 0.1mA EGSM Tx ANT2.7 V0V10mA DCS Tx ANT0V2.7 V10mA Test Circuit Control Voltage & Current Ex) Dual band ASM
GSM 900DCS1800 modeParameterunitMinMaxMinMax Rx Frequency RangeMHz92596018051880 Insertion Loss at 25 dB0.85 max1.00 max at - 30~+85 dB1.00 max1.10 max Return LossdB15.0 min Tx Frequency RangeMHz88091517101785 Insertion Loss at 25 dB1.30 max. at - 30~+85 dB1.40 max. Attenuation 2 X fgtdB30.0 min25.0 min 3 X fgtdB25.0 min 25.0 min IsolationTx - RxdB20.0 min. Return Loss dB12.0 min Current Consumption mA10.0 max. Permissible input Power dBm+35.0 peak+33.0 peak Electrical specification Ex) Dual band ASM