Until digital systems became widespread, particularly high speed ones, steady state sine waves were the normal state of affairs. It is well known that in VHF and microwave regions components cannot be thought of as lumped and specific models must be developed. This attitude is correct and must be applied when attempting to understand the performance of a component in a fast step situation. Firstly, we must have a clear understanding of what a step or pulse is. The leading edge of a step is a shock wave. It is a TEM wavefront which travels at the speed of light. Now it is mathematically possible to take a single step and analyse it using Fourier analysis.
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