The role of integrated circuits decoupling in electromagnetic compatibility
Abstract
It is pointed out that for most electronic systems, the primary source of radiated emissions is the printed circuit (PC) boards contained within that system. PC boards are effective radiators of electromagnetic interference (EMI). However, emissions can be reduced by employing suitable design techniques. Primary sources of EMI on a PC board are related to signal interconnects and the power distribution system. While the effects of signal interconnect design on EMI have received considerable attention, relations between EMI and the power distribution system have not been much considered. The present investigation is concerned with approaches to reduce EMI produced by the power distribution system. One of the keys to good power distribution is proper IC decoupling. This is accomplished by minimizing the impedance of the decoupling loop to prevent high frequency noise from propagating on the power distribution trace system. An illustrative example involving a microcomputer IC is provided.
- Publication:
-
EMC Technology
- Pub Date:
- December 1983
- Bibcode:
- 1983EMCT....2...19J
- Keywords:
-
- Circuit Boards;
- Decoupling;
- Electromagnetic Compatibility;
- Integrated Circuits;
- Noise Reduction;
- Printed Circuits;
- Capacitors;
- Electric Power Transmission;
- Electromagnetic Interference;
- Electronic Equipment Tests;
- Electronic Packaging;
- Microcomputers;
- Radiative Transfer;
- Reliability Engineering;
- Electronics and Electrical Engineering