[time-nuts] Microchip PIC CTMU

Attila Kinali attila at kinali.ch
Fri May 13 13:51:07 EDT 2016


On Fri, 13 May 2016 07:36:10 -0400
Bob Camp <kb8tq at n1k.org> 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).


			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

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