I don't need adjustable rise/fall times, I would prefer as fast as it gets. Load has some capacitance it's a LED. On Thu, Jul 4, 2013 at 8:58 PM, Sean Breheny wrote: > Do you need the rise and fall times to be adjustable or just shorter > (faster) than some value? If the latter, I would recommend looking at log= ic > gates to "square up" your signal. 74AC or 74AHC series should easily be > able to deliver <2ns rise/fall times. You may want to use schmitt trigger > versions, too. There are probably even more modern ones that can do even > better. What is your load for this signal? Any capacitance in the load wi= ll > make this more challenging and may require paralleling of several gates t= o > have sufficient drive. > > > On Thu, Jul 4, 2013 at 1:41 PM, Yigit Turgut wrote: > > > Hi collective brain, > > > > 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 go= t > > around 2ns of rise/fall times which is good but I need to make it simpl= er > > (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! > > > > Yigit > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .