As an engineering student, I'm trying to think of an analog equivalent to a flip-flop. My goal is to have a short term memory of a signal, saturating the transistor being the trigger. Kind of like an analog D flip flop.
Here is how I hope this would work :
- When Q1 is saturated, C1 quickly takes the same voltage as the input (like an RC circuit, with R close to 0).
- When Q1 is left alone, C1 keeps its charge, since the input of an OP amp is supposed to behave like an infinite resistor. Since the OP amp is in a following montage, the output voltage should be the same as C1's.
So I believe this could work, but can't experiment on it. Of course I know the OP amp isn't perfect, but my hope is that it could still be good enough to preserve C1's charge for a few milliseconds.
What do you think ? Is there some obvious mistake in there that I didn't account for ? Or could this actually work ? I lack the materials to build and try this system myself for now but I'm curious. My goal would be to put it in front of an ADC in order to presample my input.