[time-nuts] GPSDO Alternatives

[Chris Albertson]

On Thu, Dec 6, 2012 at 4:09 PM, dlewis6767 <dlewis6767 at austin.rr.com> wrote:

> could you not add just a little 'glue' outside the uP to relieve it a tad.
>
> Let the GPS' 1pps gate some ttl counters and then read for overflow or
> underflow after xxx seconds.  Have the uP determine  dac correction setting
> back to the TXCO.
>
>
That is why my first post was to ask "What is the simplest phase defector
that can work?"   I think you only need a one-bit counter.  A flip-flop
will do that.   The FF is a classic phase detector used in many PLL
-- 

Chris Albertson
Redondo Beach, California