EMC Question of the Week: June 1, 2026

Plot of the harmonics of a 10-MHz trapezoidal waveform with 0.5-nsec and 5-nsec transition times

The figure plots the amplitude of the harmonics for a 1-Vpp 10-MHz trapezoidal waveform with 0.5-ns and 5-ns transition times. With a 5-ns transition time, there is a clear (sin x)/x shape with nulls at multiples of 200 MHz. The location of these nulls is determined by the

  1. transition time
  2. duty cycle
  3. fundamental frequency
  4. rounding error

Reveal Question of the Week - Answer 260601