Hello,

when you say "measure", most probably, you still mean the simulation in Virtuoso. The approach depends on the implementation you've chosen (for example, one can have a strobe pulse launching the counter or one can charge the capacitor and measure the voltage). More details are needed, but usually one has to pass a "reference" signal with precisely known characteristics through a measurement system a number of times starting at a random moment to decouple the signal from the internal clock of the converter. The r.m.s. of the spread will give the uncertainty of a single shot.

Thanks a lot for your reply Artem G. Feofilov.

I've designed Vernier Delay Line TDC, So Start and Stop signals are there, rather than pulse Input. I'm using vpwl to generate Start and Stop signals. I'm using Fixed Start Signal and varying Stop signal that's how I'm observing Thermometer Codes.

Could you please elaborate how to Simulate (in Virtuoso) the Single Shot Precision of Vernier Delay Line TDC...?

Hope to hear from you soon.

Hi, I never used Virtuoso, but I used to work with real signals :)

In the Vernier delay line, one uses two sets of cells with slightly different delay times and counts the number of "flipped" flags, right? The measured time interval is equal to N*(tau_1-tau_2). Please, correct me if I'm wrong, but in my understanding  the uncertainty is within 1x(tau_1-tau_2), regarless of the software and representation.