[time-nuts] TAC/TDC

[Josef Kölbl]

Magnus Danielson schrieb:
> On 12/14/2010 06:10 PM, Bob Camp wrote:
>> Hi
>>
>> Do you also require precision in the ~ 1 ps range as well as resolution?
>>
>> If so, that opens up a whole series of issues about:
>>
>> 1) How long since it was calibrated
>> 2) Temperature and other environmental effects
>> 3) Traceability of calibration
>>
>> Not a simple or cheap problem to solve.
>
> A little more details in requirements should be needed...
>
> What rate of measurements? 1 measurement per second? 10? 100? 100k?
>
> What trigger-jitter is tolerated? 1 ps RMS? 10 ps RMS? 100 ps RMS?
>
> What linearity requirement is needed? 1 ps? 100 ps?
>
> Do you mean that "<= 1 ps resolution" really means that time 
> quantization needs to be less than 1 ps?
>
> Essentially, a little more insight to the actual need for the 
> application at hand is needed for good assistance.
>
> BTW. The ACAM TDC-GPX gets you down to 10 ps...
>
> Cheers,
> Magnus
>
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Magnus,
with regard to your questions:
measurement rate = 1 kHz
rms jitter <= 10 ps
linearity better 3 ps
resolution of 1 ps is the minimum differential measurement which can be 
made (ie granularity).
Thanks.