On Fri, May 13, 2016 at 07:51:07PM +0200, Attila Kinali wrote: > On Fri, 13 May 2016 07:36:10 -0400 > Bob Camp <[email protected]> wrote:
>> Given that a “real” TDC is a resistor and capacitor >> attached to a FPGA pin (plus the ADC) the cost of doing it >> better is not all that much. You can get down to a few hundred >> ps without a lot of crazy effort ( still using the MCU ADC). > The PICTIC II did 250ps resolution with an effective resolution > of 680ps[1]. > The upgraded version III had IIRC a resolution of ~25ps with > better than 100ps achieved. Eventhough the PICTIC III design is > a bit more involved than then II, it's still relatively simple > (it uses more stable current sources, buffer opamps, external > ADCs and an active offset compensation scheme). Hmm, sounds interesting ... Is there a PICTIC III schematic somewhere? Thanks in advance, Herbert > Attila Kinali > PS: Does anyone know what happend to Richard McCorkle? I haven't heard > of him in ages. > [1] http://www.ke5fx.com/pictic.htm > -- > Reading can seriously damage your ignorance. > -- unknown > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
