"Pulse and Digital Circuits" by Anand Kumar is an important book for several reasons:
V(t)=Vfinal−(Vfinal−Vinitial)e−t/τcap V open paren t close paren equals cap V sub final end-sub minus open paren cap V sub final end-sub minus cap V sub initial end-sub close paren e raised to the negative t / tau power pulse and digital circuits anand kumar pdf