Racing against the clock and faced with the increasing rise time of logic, most of today's high-speed electronic designers are concerned with the radiation of their design. Deftronics can help you address the EMC/EMI/EMI issues of your design. Deftronics provides on-site EMC/EMI/EMI analysis methodology training as well as on-site/off-site EMC/EMI/EMI analysis support.

Most designers are aware that multilayer boards provide better EMC/EMI/EMI control than double-sided boards, and that embedding traces between planes can suppress EMI dramatically.

However, people still make double-sided boards and route high speed traces on surface layers due to the overriding factor of "cost". In reality, of course, "cost" is not only the monetary expense of the board. There is also the cost of violating design rules for timing, manufacturing, thermal and other product concerns.

The real challenge thus facing designers is to achieve a good EMC/EMI design in a "cost-effective" day. However, knowing the "cost" is only half the story. To assess the "effectiveness" of implementing specific EMC/EMI rules or EMC/EMI fixes, early stage simulations are required to quantify EMC/EMI problems. The ability of EMC/EMI simulations to quantify EMC/EMI problems not only requires early identification of critical areas but also assessment of the effectiveness of various EMC/EMI reduction solutions.

All time varying currents in a system, whether intended or undesired, radiate. In order to understand EMC/EMI better, it is essential to think in terms of currents rather than voltages and in terms of the frequency domain rather than the time domain.

It is also important to bear in mind that currents radiate more efficiently at higher rather than lower frequencies. Noise currents induced on cables or shields, though much smaller than intended signal currents, can also radiate more significantly (this is because the cables or shields to which they are attached make good antennas).

In a typical system, many EMC/EMI mechanisms are impossible to track completely. In fact, some mechanisms are still not properly understood. Fortunately, it is not necessary to understand and track all EMC/EMI mechanisms to meet EMC/EMI standards as most EMC/EMI problems are associated with a few dominant mechanisms.