[time-nuts] Microchip PIC CTMU

Herbert Poetzl herbert at 13thfloor.at
Sat May 14 14:51:44 EDT 2016


On Fri, May 13, 2016 at 07:51:07PM +0200, Attila Kinali wrote:
> 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).

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
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