[time-nuts] crunching numbers from XOR phase detector (mike cook)

[Dan Kemppainen]

>> Neat.  Thanks for sharing.
>>
>> With a XOR, you can't tell which input is higher frequency.  I think you can
>> fix that with a second XOR and a delay line.
>>
>> I think 90 degrees of delay will provide the most information.  At 10 MHz,
>> that's 25 ns.  I think that's about 15 feet of good coax.
>>
> all that spaghetti made me wonder if you can get it on a chip . yes, it
> seems.  ex  EP8034, 200ns in tenths. there are others of course.
>
http://www.minicircuits.com/pdfs/JSPHS-12.pdf
It's not digital. It is an alalog adjustable voltage controlled phase 
shifter. If you want to shift a  relatively clean 10Mhz sine...