Andrew Beckett
Senior Fellow
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Life, don't talk to me about Life...
Posts: 1742
Bracknell, UK
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Re: How to implement S&H without hiden state?
Reply #4 - Sep 23rd, 2003, 4:02am
I spoke to Ken about this a couple of weeks ago, and he said that he'd used the models from the hidden state paper...
Now, in a real implementation, would it actually be a true sample and hold (i.e. an infinitely narrow aperture)? Or would there actually be some time for the storage element (the capacitor) to charge up...
I'd expect most real sample and holds to be track and holds (i.e. the capacitor is charged whilst the switch is closed, and held when it is open).
I guess if you don't want the output to track the input whilst the input is changing, you could always do this with two track-and-holds, one after the other, with the clocks inverted - that way the second tracks the held voltage from the first. Something like that anyway...
Andrew.
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