1. Your scope shots in post #1show output pulses (spikes) at every positive ***and negative*** transition of the input square wave. This is different from what you describe in post #5, so please clarify.
2. Do you want the output to be a spike, or a pulse? A pulse is different from a spike. A pulse has a leading edge, a nominally flat top or a measurable width, and a trailing edge. Usually, a spike has a rapid, straight-line increase for the leading edge up to a point, then a less rapid exponential decrease for the trailing edge. A common description for the width of the spike is the width at 50% of the peak amplitude.
3. What is the desired output pulse amplitude.
4. What is the desired output pulse width?
ak