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Honored Contributor

11 years ago

High frequency counter

I am new on FPGA, then sorry for the little knowledge. In my application I have to measure the transit-time of an ultrasonic signal, for that I will develop a counter, but I need the frequency ...

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Honored Contributor

11 years ago

Here are some links:

http://www.alteraforum.com/forum/showthread.php?t=28472 (http://www.alteraforum.com/forum/showthread.php?t=28472)

This one:http://www.alteraforum.com/forum/showthread.php?t=24720 (http://www.alteraforum.com/forum/showthread.php?t=24720) hints on using the serdes.

Another idea discussed on this forum was to use a GX-receiver in basic mode as a sort of 'logic analyser'. That would go up to 3.25 GHz.

How do you form your input pulse? How large are these transition times?

I assume you have a comparator or something to detect the transition-time.

You may also want to take a look at time to digital convertors (http://en.wikipedia.org/wiki/time-to-digital_converter)