Comb Generator As a Reference Source
We start with the discussion of what is a comb generator. It is an electronicdevice that produces a very fast (impulse-like) pulse repeatedly. An impulse by definition, however, has an infinitely high amplitude and infinitesimal duration, which translates into frequency domain as a broadband signal covering the entire spectrum. Of course, this definition is only for theoretical discussion, and cannot be produced in practice. A comb generator is an implementation of this idea. It generates a very short, fast pulse with a sharp rise time and a sharp fall time. The rise time and the fall time are extremely small, but are non-zero. The pulse is continuously repeated as frequency (F), translating into a series of frequencies, which are multiples (or harmonics) of F, in the frequency domain.
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