Dr Bruce Griffiths <[EMAIL PROTECTED]> wrote: > Yet another high resolution time interval interpolation technique is to > sample a pair of quadrature sinewaves at the leading edge of the pulse > to be time stamped.
These are all variants of what I (because of my high-energy physics background!) call "Time to amplitude converters". The traditional concept is to just generate a ramp (with RC or a little better constant current source + capacitor) and stop charging and then (at your leisure...) sample where it stopped. But Bruce's suggestions are substantially more advanced in that they do not suffer from "dead time" to reset the integrator (and we all know how hard it is to surely reset a capacitor quickly! this is where I learned all about capacitor "soak") and some of them (like the quadrature sinewaves) allow you to do "end-to-end" corrections for even the slightest amplitude offsets/miscalibrations. I guess technology has advanced since I did this stuff in the 70's with NIM bins and early CAMAC crates :-). (Next thing you know, Bruce will tell us how he was doing this in the 60's! and in fact the quadrature sinewave thing was in fact in use as far back as the 50's for RADAR, but not with DAC's and computers...) Tim. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
