What is Electromagnetic Compatibility?

1. VCC Q Pulse Width Modulator _______ Q VIP Section: Electromagnetic Compatibility (EMC)/Signal Integrity (Spring 2014)Members: Jin Bai, Andy Chu, Fabian Faes, Wei Jiang, Yugang Jing, Songrui Li, Zihui Liu, Xi Wang, GenaXie, ShiyaoZhanga;Team Advisors: Prof. J. V. Krogmeier, Prof. Barrett Robinson; Graduate mentors: Alex Layton, Andrew BalmosElectromagnetic Radiation Testing High Side Driver Low Pass Filter Low Side Driver A computer system is being tested for radiated emissionsby DLS Electronic Systems, Inc of Wheeling, IL . The table is rotated and radiation emitted from the system is measured at many azimuth and elevation angles over the hemisphere above it. Regulations require measurement of the radiation from MHz to 6 GHz at each point. What is Electromagnetic Compatibility? Faults and faulty design cause some electronic equipment to emit electromagnetic radiation that interferes with other electronic equipment. To protect against such equipment, all equipment sold in US must demonstrate compliance with: United State’s FCC Part 15 Regulations. These rules establish limits on radiated and conducted emissions for all devices having clock frequencies from 9 kHz to 6 GHz. Similar rules apply around the world. Pre-Compliance Radiated (will use near field techniques) Pre-Compliance Conducted SEMESTER GOALS Refresh ECE skills. Build and test PWM audio amplifer for radiated and conducted emissions. Test commercial products. May 3 Field Trip to DLS Electronic Sys. Test our product, tour their facilities, and watch demonstrations. 10 Watt PWM Audio Amp System Diagram Proto-board Circuit  Right and Two-Hand Rules Crosstalk in Cables Ground Noise in Digital Logic Shielding and Grounding Near and Far Fields More References Henry Ott, Electromagnetic Compatibility Engineering Clayton Paul, Introduction to Electromagnetic Compatibility