1 / 16

GSM (Global System for Mobile communication )

GSM (Global System for Mobile communication ). GSM Frequency Allocation Table. Dual Band. Triple Band. GSM 900 Tx Rx. DCS 1800 Tx Rx. PCS 1900 Tx Rx. MHz. higher GSM frame structures. 5. 7. 8. 1. 2. 4. 6. 3. 4.615 ms. 546.5 µ s. 577 µ s.

gwyn
Download Presentation

GSM (Global System for Mobile communication )

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GSM (Global System for Mobile communication)

  2. GSM Frequency Allocation Table Dual Band Triple Band GSM 900 Tx Rx DCS 1800 Tx Rx PCS 1900 Tx Rx MHz

  3. higher GSM frame structures 5 7 8 1 2 4 6 3 4.615 ms 546.5 µs 577 µs GSM Frequency & Frame structure 935-960 MHz 124 channels (200 kHz) downlink - 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 frequency 890-915 MHz 124 channels (200 kHz) uplink time GSM TDMA frame GSM time-slot (normal burst) guard space guard space S user data tail tail user data S Training 1 3 1 57 bits 3 bits 57 bits 26 bits

  4. AdvancedMaterialOnTECHnology ASM & FEM

  5. What is ASM, FEM? 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 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

  6. Mobile handset block diagram GSM 900 Rx DCS1800 Rx GSM 900 Tx DCS1800 Tx

  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. 5440 : AMAD5440-01 • 4532 : AMAD4532-01 • 6750 : AMFD6750-01 Dual Band ASM Dual Band FEM Triple Band ASM Triple Band FEM • 5440 : AMAT5440-01 • 6750 : AMFT6750-01 • 5440 : AMFT5440-01 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 .

  9. Main size for current market (5440, 4532) 5.0mm 6.7mm Market trend 6750→5440 →4532 → 3216 4.0mm 3.2mm 5.4mm 1.6mm 4.5mm 3.2mm > 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.

  10. Components of ASM,FEM DIPLEXER, DIODE, LPF, SAW, VARISTOR Dual ASM Dual FEM Dual FEM with varisotr Diplexer 1EA Diode Switch 2EA LPF 2EA SAW Filter 2EA Varistor 1EA~4EA Diplexer 1EA Diode Switch 2EA LPF 2EA SAW Filter 2EA Diplexer 1EA Diode Switch 2EA LPF 2EA

  11. Block Diagram Dual band ASM Dual band FEM Triple band ASM

  12. Ex) Dual band ASM Dimension Pin Layout

  13. Ex) Dual band ASM Control Voltage & Current Test Circuit

  14. Ex) Dual band ASM Electricalspecification

  15. Ex) Dual band ASM S11,S21 graph GSM Rx GSM Tx DCS Rx DCS Tx

  16. Ex) Dual band ASM Smith chart GSM Tx GSM Rx DCS Tx DCS Rx

More Related