The effect and solution of EMI caused by 217 Hz TDMA switching from compact size GSM security system

Author

Hsiao-Bin Liang ; Dau-Chyrh Chang ; Guo-Hsiang Lo ; Chin-Wen Chang

Author_Institution

Climax Technol. Co., Ltd., Taipei, Taiwan

fYear

2011

fDate

8-10 Aug. 2011

Firstpage

186

Lastpage

190

Abstract

This paper portrays the effect and solution of radiation interference from antenna to the base-band audio circuit. The 217 Hz TDMA modulation of GSM module constitutes a form of switching noise and causes the EMI problem in audio frequency. Differential and single-end PCB layout architectures are simulated and compared by full 3D EM simulator, GEMS, for observing the appearance of common mode noise cancellation mechanism. The actual two-way voice communication testing is also operated to verify the efficacy of noise cancellation by this differential architecture.

Keywords

antennas; cellular radio; electromagnetic interference; interference suppression; printed circuit layout; telecommunication switching; time division multiple access; EMI; GEMS; GSM module; TDMA modulation; TDMA switching; antenna; base-band audio circuit; common mode noise cancellation mechanism; compact size GSM security system; differential PCB layout architecture; frequency 217 Hz; full 3D EM simulator; radiation interference; single-end PCB layout architecture; switching noise; two-way voice communication testing; Antennas; Electromagnetic interference; GSM; Layout; Noise; Solid modeling; Time division multiple access; Antenna; EMI; GEMS; PCB; common mode noise; differential;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetics, Applications and Student Innovation (iWEM), 2011 IEEE International Workshop on

Conference_Location

Taipei

Print_ISBN

978-1-61284-462-6

Electronic_ISBN

978-1-61284-461-9

Type

conf

DOI

10.1109/iWEM.2011.6021453

Filename

6021453