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Automotive AM-Band Radiated Emission Mitigation Techniques, a Practical Approach




Philips flat screen TV with 6 channel Class D audio have been using shielded coils for many years for the output filter of their Philips (now NXP) Class D ICs. The coils are TOKO DASM1620.

Toko Shielded Coil Data Sheet


Southeastern Michigan IEEE EMC Society technical meeting.


Building: U of M Dearborn
Room Number: 126
Fairlane Center North
19000 Hubbard Drive
Dearborn,  Michigan
United States 48124
Date: 21-June-2012
Time: 05:30PM to 07:30PM (2.00 hours) All times are: America/Detroit


No Admission Charge.

Registration Closed


Cyrous Rostamzadeh

Topic: Automotive AM-Band Radiated Emission Mitigation Techniques, a Practical Approach

Radiated emission (RE) compliance requirements of automotive sector demands one of the most difficult design challenges for EMC engineers as compared with those of FCC and military standard mandates. Recent revisions to the US automotive OEM specifications has mandated the radiated emission requirements for the Global Medium Wave (AM) band (0.53 MHz – 1.7 MHz) to be reduced to the new miniscule level of 12 dBuV/m utilizing average detection method. The previous specifications required a 30 dBuV/m using peak measurement method. This has an enormous impact for the EMC design engineers to employ cost effective mitigation techniques available, such as robust PCB design practices, or with the use of EMI filters. OEM warns that onboard receivers in modern vehicle intended for the reception of the audio broadcast services (AM band) can be susceptible to any unintended noise source(s) exceeding 12 dBuV/m level. It is clear that the modern vehicle is abundantly rich in noise source with a large number of electrical and electronics components in close proximity. One particular area which will make life very difficult for EMC engineers is the use of switch mode power supply operating at switching frequencies below 1.7 MHz. This presentation will examine a “source-path-victim” scenario relevant to SMPS circuits with analysis and technical background to identify and locate the source of noise, its coupling path and mechanism to the victim antenna. It will be complemented with measurements to provide solutions to resolve AM band non-compliance issues to meet the12 dBuV/m requirements

Biography: Cyrous Rostamzadeh is currently an EMC Technical Specialist at Robert Bosch LLC, Plymouth – Michigan, where he has implemented an EMC design and analysis process to facilitate product compliance at the lower cost. Since 1997 at Bosch, he is engaged in PCB and system level EMC robustness techniques and solutions. He is responsible to provide product design support and EMC interface to NA, Asian and European automotive market. During the past 15 years at Bosch, he has played key role in the design, development of EMC and signal integrity solutions for global Bosch market.
Prior to joining Bosch, he was a senior EMC engineer at Ford Motor Company. His extensive research on load dump transient event resulted in identification of realistic waveform. His research has shaped the revised US EMC automotive standards. He was a core member of Ford EMC design and test process methodology team. In addition to Ford, he was a senior EMC engineer at General Motors Corporation. From 1989 – 1994 he was a senior electrical engineer at Superconducting Super Collider Laboratory (SSCL) Dallas, Texas. He was responsible for development and design of quench protection and detection electronics for superconducting magnets. He was also employed at National Semiconductor as analog engineer. He spent 3 years at Grunding Corporation as RF engineer.
Cyrous received a B.Sc. (Hon.), M.Sc. in Physics and MSEE in Electrical Engineering from Imperial College of Science and Technology, University of London (UK). He is an associate of the Royal College of Science (UK). He participated at MIT during the summer of 1990 on the design and development of High Power SSCL Quench Bypass Switch. He received Particle Accelerator Physics training at Stanford University (1992). He is a senior IEEE member, NARTE certified EMC and Product Safety Engineer. He is an active member of IEEE EMC TC-9 Computational Electromagnetics committee. He has given numerous EMC seminars and training courses to Bosch engineering associates, IEEE SE Michigan EMC Chapter, universities and international EMC organizations. He has published extensively at IEEE EMC, IEEE PAC, URSI-GA and ASEE symposium. Cyrous was an invited guest speaker at European Space Agency (ESA) Florence, Italy - March 2009. He has 1 patent and 2 patents pending.

Meeting Agenda:

5:30 Pizza and Refreshments

6:00 Technical Presentation

7:30 Questions and answers