[time-nuts] Microchip PIC CTMU

[Daniel Mendes]

Only found info about PICTIC 1 and 2:

http://www.ko4bb.com/doku2015/doku.php?id=precision_timing:pictic

Where´s info about PICTIC III?

Daniel

Em 13/05/2016 14:51, Attila Kinali escreveu:
> 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
>