檢視 $solvetimestep 的原始碼

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

 $solvetimestep
 number_of_different_steps(Nt)
 steptype <math>\delta t ~~   t_{total}</math> par1 par2 par3 par4 ....    
 steptype <math>\delta t ~~   t_{total}</math> par1 par2 par3 par4 ....    
 ...
 steptype <math>\delta t ~~   t_{total}</math> par1 par2 par3 par4 ....    repeat Nt times


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

 Steptype  = 1:  <br>
 <math>\delta t,~~ t_{total},~~ vg_0 </math><br>
  vg=vg_end for t<0, for t>0, vg=<math> vg_0  </math><br>

 Steptype  = 2:  <br>
 <math>\delta t,~~ t_{total},~~ vg_0 ,~~ A_{0} ,~~ \omega,~~ c_{0} </math><br>
 <math> vg=vg_0 +  A_{0} \times sin\left( 2\pi \omega t + c_0 \right) </math><br>

 Steptype  = 3:  <br>
 <math>\delta t, ~~t_{total},~~ vg_0 ,~~  A_{0} ,~~ \omega ,~~ c_{0}  </math><br>
 <math> vg=vg_0 +  int(A_{0} \times sin\left( 2\pi \omega t + c_0 \right)) </math><br>



For example: <br> 

 $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
  <math> vg=3.0 + 0.1 \times sin\left( 2\pi \times 10^{6} t  \right) </math><br>
 then run
  <math> vg=3.2 </math><br>