FREQ COUNTER help

Hi i am presently trying to build a counter that counts freq upto 65536 Khz
in less than 1 msec is this possible also has any one any ideas to where i
should start thanks in advance for your help.

Paul

 

"Paul Taylor"

** You need a " period counter " - some frequency counters have this
feature.

Instead of totalling up completed cycles over 1 second, a very high
frequency oscillator is gated *on* for one cycle ( or 10 or 100) to count
microseconds and decimal divisions thereof.

If you get 15.259 uS - you are home and hosed.




........ Phil

 

Obviously enugh, a counter driven at 65536kHz - I presume you mean
65.536MHz - will accumulate 65536 counts in one millisecond.

You will need a stable local oscillator to define your millisecond -
traditionally divided down from a 10MHz crystal oscillator, but more
precise solutions are available.

A 16-bit wide synchronous counter capable of running at 66MHz isn't
entirely trivial. Just stringing together regular TTL or CMOS parts
won't work, because the freely available 74F and 74ACT and similar
synchronous counters aren't quite fast enough. Making the first stage
of your counter out of a separately packaged JK-flip-flop might be
enough to get you over the hump, but most of the recent programmalbe
logic parts are fast enough and big enough t let you realise a suitable
16-bit synchronous counter in a single package.

I would help if you told us more about what you are trying to do.

 

sorry typo error 65536 (2 to the power of 16)

 

Phil are these regularly available any where?

 

Phil do you have any examples ect.... this sounds like the way i should go
maybe?

 

"Paul Taylor"

** Top posting is both a usenet crime and an insult to others.

STOP IT NOW !!!!!!!!!!!!

Plus:

EXPLAIN what the **** you ACTUALLY want and WHY !!

So far you are just like any other PITA troll.





.......... Phil, grrrrrrrrrrr

 

** YOU are just BEGGING for it - Mr pommy arsehole.

Not JUST another EVIL top poster, but a fuckwit BLANK PAGE poster too.


Observe usenet etiquette - or GO DROP DEAD !!





......... Phil

 

Thanks for your kind remarks Phil i hope i have it right this time?

 

--

-----------------------------------------------------
Paul Taylor BSC (Hons)
Electronics Technician
School of Environmental Science
University of East Anglia
Norwich
NR4 7TJ

Phone: +44 (0)1603 592502
Fax: +44 (0)1603 591327

Email:
Web: http://www.uea.ac.uk/~e087

 

** Right up you stupid fucking arse - you smug, autistic pommy pig.







........ Phil

 

** Wot a complete fool.






......... Phil

 

Phil im not a troll, i am interested in the period counter concept you said
about i searched the web and cant seem to find much about it.

Thanks

by the way what is a troll?

 

Oh Dear

http://en.wikipedia.org/wiki/Troll


martin

 

Thanks for that martin so im some bad furry creature......

Sorry john for top posting i think i have got to grips with this newsgroup
business now my bottom limit is basically 1hz with a resolution of 1hz to.
any of you guys now about period counters Phil was saying that this could be
the way to go?

Thanks

 

No, you've got to get grips with your news reader. Simply move the cursor to
the bottom of the original text before starting to type (after deleting
irrelevant text). Simple.

Meindert

 

is this ok? i get help hopefully in the end for the problem i firsted posted
for?