Comments on "A Fully Electronic System for Time Magnification of Ultra-Wideband Signals"

This paper discusses comments on the article "A fully electronic system for time magnification of ultra-wideband signalsrdquo. The said paper by Schwartz et al. recently demonstrates time stretching of RF signals entirely in the electronic domain, which is in contrast to the large body of work that implements RF time stretching in the optical domain. Such strict RF technology allows for simplified integration accompanied by a reduction in system complexity. Unfortunately, the said paper mixes discussion of the "photonic time-stretch" technique with discussion of RF and optical implementations of the "time-lens" technique. This leads to incorrect conclusions about the limitations of the photonic time-stretch technique. This paper intends to discuss subtleties of these technologies that will then clarify the limits and applicability of each technique.