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The LM2674 is just max 0.5 A. But for high efficiency, you can't get that price (in mouser is above 2€)
https://www.mouser.com/Search/Refine.aspx?Keyword=LM2674
not to mention the necessary components such as the inductor.
I am not sure I get your question:
If you have a rectangular signal, the sinc function is the spectrum of the signal (you just need to take the positive frequencies and double the amplitude for the one-sided spectrum).
If your rectangle is a filter (like a sample and hold circuit), your input...
Following the line of ducvilla, here is another suggestion:
Daniel Schinkel et. al,A Double-Tail Latch-Type Voltage Sense Amplifier with 18ps Setup+Hold Time, 2007
It has one stage for the diff pair and another for the regenerative stage. The diff pair has low tail current, thus low slew rate...
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