$solvetimestep

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

$solvetimestep
number_of_different_steps(Nt)
steptype $\delta t{t}_{total}$ par1 par2 par3 par4 ....    
steptype $\delta t{t}_{total}$ par1 par2 par3 par4 ....    
...
steptype $\delta t{t}_{total}$ par1 par2 par3 par4 ....    repeat Nt times

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

Steptype  = 1:  

$\delta t,t_{total},v{g}_0$

 vg=vg_end for t<0, for t>0, vg=$v{g}_0$

Steptype  = 2:  

$\delta t,t_{total},v{g}_0,A_0,\omega ,c_0$

$vg=v{g}_0+A_0\times sin(2\pi \omega t+c_0)$

Steptype  = 3:  

$\delta t,t_{total},v{g}_0,A_0,\omega ,c_0$

$vg=v{g}_0+int(A_0\times sin(2\pi \omega t+c_0))$

For example:

$solvetimestep
2
2 1.0e-10 1.0e-6 3.00 0.1 1.0e6 0.0 
1 1.0e-10 1.0e-6 3.20 
first run
 $vg=3.0+0.1\times sin(2\pi \times 10^{6}t)$

then run
 $vg=3.2$

The $solvetimestep setting for 1D-DDCC in GUI interface

3.Modify the number of layers.

4.Choose the steptype.
5.Modify the parameters.