$solvetimestep

$solvetimestep is a command for solving the transient behavior of the device. The format is

$solvetimestep
steptype
parameters(1) parameters(2) ....    

The number of parameters depeding on step type. Now we have 3 step types

Steptype  = 1:  

$\delta t, t_{total}, vg_0$

 vg=vg_end for t<0, for t>0, vg=$vg_0$

Steptype  = 2:  

$\delta t, t_{total}, vg_0 , A_{0} , \omega , c_{0}$

$vg=vg_0 +  A_{0} \times sin\left( 2\pi \omega t + c_0 \right)$

Steptype  = 3:  

$\delta t, t_{total}, vg_0 ,  A_{0} , \omega , c_{0}$

$vg=vg_0 +  int(A_{0} \times sin\left( 2\pi \omega t + c_0 \right))$