Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
You can configure a diode, capacitor and resistor to create a ramp effect which will either (a) extend a positive pulse by decaying gradually to zero, or (b) slow the upward transition of a pulse so as to cause a delayed high.
Then you can feed the ramp waveform to a schmitt trigger, and adjust the level so it triggers at the proper spot along the ramp which will yield the pulse length you want.