Linear Rise exponential fall pulse generator
EDIT: I tried to to ismulate this, but something is wrong in circuitlab simulator.







You can controll a circuit similar to Marx generator. Where you have T_rise and T_fall, both exponential, but if input voltage is much hiher than needed peak, and R_rise is small enough you can get almost linear rise, perhaps adding an inductor can improve.

http://u2.lege.net/newebmasters.com__freeenergy/external_links_from_theverylastpageoftheinternet.com/highvoltage/marxgenerator/marxgenerator.htm







simulate this circuit &ndash; Schematic created using CircuitLab







simulate this circuit







simulate this circuit