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Hey guys, I need some help here. Can you please give me some direct hint on how to build a 22Mhz sample and hold circuit? It's for my lab next week. Thanks.
The problem is, my lecturer wont allow me to use a single chip, I have to construct a full circuit instead. The good news is as long as I can reach more than 5Mhz it should be ok. Help me please. Really appreciate it.
The easiest way is to use a series FET that drives a capacitor to hold the voltage. You can DC bias the gate so the FET is normally off, and has a short pulse turn on the fet. The short pulse can be either from some sort of one-shot circuit, or could be a ac coupled spike from a squarewave rising edge.
If you had a much faster waveform to sample, you would use a low capacitance schottky diode(s) and some sort of balun to momentarily turn them on.
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