"$useconstId" 修訂間的差異
出自 DDCC TCAD TOOL Manual
(已建立頁面，內容為 "Since DDCC solver is solved by input bias, therefore it is hard to obtain the exactly desired current density. $useconstId is a command for the program to get a cer...") |
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| 行 6： | 行 6： | ||
| − | The Ig_value is the current density of gate ( or Base). The unit is A/cm since it is 2D simulation. |
+ | The Ig_value is the current density of gate ( or Base). The unit is A/cm since it is 2D simulation. '''The Id is define as (Jpd-Jnd). Be careful about the sign.''' |
The simulation program need to set Vd = constant and Vd (VC) in a range. Vs (VE) can be treated as emitter. |
The simulation program need to set Vd = constant and Vd (VC) in a range. Vs (VE) can be treated as emitter. |
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於 2022年9月21日 (三) 18:47 的修訂
Since DDCC solver is solved by input bias, therefore it is hard to obtain the exactly desired current density. $useconstId is a command for the program to get a certain Id value by tuning the bias itself to reach the required gate current. However, it is very time consuming.
$useconstId Id_value V_trial_min V_trial_max Vd_step_min Precision
The Ig_value is the current density of gate ( or Base). The unit is A/cm since it is 2D simulation. The Id is define as (Jpd-Jnd). Be careful about the sign.
The simulation program need to set Vd = constant and Vd (VC) in a range. Vs (VE) can be treated as emitter. The program will try in a Vd bias ranging fromin a minimum Vd interval Vd_step_min. Once the current error is within Precision
For example $Schottky 1.4 $gatebias 0.9 0.9 0.01 $drainbias 0.5 5.0 0.5 $sourcebias 0.0 $useconstId 1.0e-3 -0.2 0.2 1.0e-4 1.0e-3
