doubt on lightning impulse generation with the help of double exponential function
I get the doubt on double exponential block, kindly help me. I am talking about the value of "A" (that is coefficient of exponent ).how did i set or calculate this value, is there any mathematical expression for it? Somewhere I get a value for "A" and "B", (-4166000 & -13000), this two values are for 1.2/50us but I am unable to understand the logic behind it.
If I want to generate a 250/2500us then what should be the value of "A" &"B'' and how?