On Thu, Jul 4, 2013 at 1:41 PM, Yigit Turgut <y.turgut@gmail.com> wrote:

> I want to generate a pulse/square signal with a few nanoseconds of
> rise/fall times. I did this with various PIC's and with FPGA's and I got
> around 2ns of rise/fall times which is good but I need to make it simpler
> (cheaper).
>
> Now I am trying to implement the same with completely analog components ;
>
>  width ; adjustable between 2ns-10ns
>  frequency ; adjustable between 1Hz-200Hz
>  amplitude ; adjustable between 5V-12V
>
> I know there are some defacto ways to do this but I feel rusty on the
> analog side and would appreciate the guidance of analog experts here. I
> know you are out there, don't hide!

Check out Jim Williams avalanche pulse generator on pages 32-34 of
Linear's app note #72:

http://cds.linear.com/docs/en/application-note/an72f.pdf

-p.
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