YOUR AIMS

On completion of this lesson, you should be able to:

• understand the principles of disturbance generation in digital circuits

• understand the causes of susceptibility of digital circuits to disturbances generated by other digital circuits

• apply simple design rules to ensure EMC in digital circuits.

ASSESSMENT QUESTIONS

1. From the point of view of EMC, what are the main differences between different logic families?

2. Could a 500 kHz digital signal with switching times less than 5 ns cause interference to short wave radio reception on 28 MHz?

3. Why would capacitors with values less than 1 nF or greater than 1 μF probably not be suitable for decoupling individual ICs?