Design for EMC compliance: A rugged voice & data terminal

Electromagnetic Compatibility (EMC) problems are one of the major problems that should be considered at every stage from the design to the production of electronic equipment. Especially, while designing the user terminals for harsh environments employing displays and various connectors, special attention should be paid to comply with EMC requirements. Because of tendency to reduce the device sizes, increasing the functionality, more complex circuits with higher clock speed is needed. Therefore, EMC compliance is becoming a more difficult task. Since product design is very costly and time consuming, especially for the products which have high operating frequency, there is a great need to evaluate EMC/EMI in the design environment. This paper focuses on the design for EMC compliance for a Rugged Voice & Data Terminal. The minimization of the radiated and conducted emission is described from the design of PCB to manufacturing of whole unit. Furthermore, electromagnetic tests, performance criteria and test results for the Rugged Voice & Data Terminal are given.