Josef Kölbl wrote:
I am looking for a commercial drop-in module/solution of a
time-to-analog or even time-to-digital converter module with <= 1 ps
resolution (device should eventually go on a printed-circuit board).
Critical issues are: linearity, stability, accuracy, jitter and
precision. The maximum time interval to be measured shall be <= 25 ns.
Do you know of any commercial products? I will require more than 1 unit.
Thanks.
Josef
The only single chip TAC/TDC with 1ps resolution and noise that I've
seen any publications on used a custom implementation of a TAC that
used a state of the art IC process.
These were intended for particle physics use.
I'm not sure if they moved beyond the prototype stage.
Moving the entire TAC to a single chip allows a very small ramp
capacitor to be used as well as reducing interconnection parasitics etc.
Without using a custom IC implementation of a TAC, one can either use a
similar approach to that used in the Wavecrest DTS2075 with its
attendant high power dissipation or perhaps use a triggered ringing LC
circuit plus a fast ADC.
The highest single shot resolution TD chip (TDC-GPX) available from ACAM
is about 10ps.
Suitable averaging techniques can achieve sub ps resolution provide that
the chip nonlinearities are corrected for.
Bruce
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