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Input rise time of start/stop pulse to the TDC

vinogunasekaran

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How much should be the input rise time of the start/stop pulse to a TDC? What determines it?
 

KlausST

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Hi,

I don't understand your question .... because we don't know which IC you use nor do we know your application requirements.

General answer:
If I wanted to know this, I'd read it's datasheet.

Klaus
 

FvM

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At least fast enough to allow clear edge detection, preferably fast enough not to introduce additional timing uncertainty.
 

vinogunasekaran

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Hi,

I don't understand your question .... because we don't know which IC you use nor do we know your application requirements.

General answer:
If I wanted to know this, I'd read it's datasheet.

Klaus
ya, for IC's i can see the datasheets. But I wanted to design a TDC of my own, say a simple vernier delay line TDC. Based on what should I fix the limit of my input rise time
--- Updated ---

At least fast enough to allow clear edge detection, preferably fast enough not to introduce additional timing uncertainty.
yes, how much should it be fast, timing uncertainity i get it.
 

FvM

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Rise time converts noise and logic threshold variations into timing inaccuracy. You can use slower rise time for trigger signals but will face reduced timing accuracy.
 

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