SIMPLORER User Manual V6.0 - FER-a

4
5
138 Modeling with Circuit Components
For positive values of V* JNCT (enhancement region) the following formula is used to calculate
the capacitance:
⎛ ⎛ – ------------------------------------------------------------------------------------⎞⎞
( BETA – 1)
⋅ VDIFF
( ) = C0 ⋅ ⎜1+ ( BETA – 1)
⋅ ⎜1 – e
⎟⎟
⎜ ⎜ ⎟⎟
⎝ ⎝ ⎠⎠
CV∗ JNCT
At negative values of V* JNCT (depletion region) the following formula applies:
CV∗ ( JNCT)
C0 DELTA
1 – DELTA
1 V∗
⎛ JNCT
– ------------------- ⎞
⎝ VDIFF⎠
APHA
⎛ ⎞
⎜ ⎟
= ⋅ ⎜ + ----------------------------------------------- ⎟
⎜ ⎟
⎝ ⎠
To damp the oscillations that may occur in the system, additional damping resistances are
placed in the model. The values of the damping resistances depend on the parameter DAMP-
ING, the values of the parasitic inductances and the values of the internal capacitances.
L
RDAMP =
DAMPING ⋅ ------------
CV ( )
Component Parameters (+ Parameters of TYPE DYN=0)
V∗JNCT ⋅ ALPHA ⋅ ( 1 – DELTA)
Description [Unit] Parameter Name Data Type
Gate-Source Capacitance [F] C0_GS real
Drain-Gate Reference Capacitance [F] C0_DG real
Diffusion Potential of Drain-Gate Capacitance [V] VDIFF_DG real
Voltage Shift of Drain-Gate Capacitance [V] VSHIFT_DG real
Capacitance Exponent Drain-Gate ALPHA_DG real
Peak Factor of Drain-Gate Capacitance BETA_DG real
Influence of constant. Capacitance at Drain-Gate DELTA_DG real
Drain Bulk Reference Capacitance [F] C0_DB real
Diffusion Potential of Drain-Bulk Capacitance [V] VDIFF_DB real
Voltage Shift of Drain-Bulk Capacitance [V] VSHIFT_DB real
Capacitance Exponent Drain-Bulk ALPHA_DB real
Peak Factor of Drain-Bulk Capacitance BETA_DB real
Influence of constant. Capacitance at Drain-Bulk DELTA_DB real
Source-Bulk Reference Capacitance [F] C0_SB real
Diffusion Potential of SB Capacitance [V] VDIFF_SB real
Voltage Shift of Source-Bulk Capacitance [V] VSHIFT_SB real
Capacitance Exponent Source-Bulk ALPHA_SB real
Peak Factor of Source-Bulk Capacitance BETA_SB real
Influence of constant. Capacitance at Source-Bulk DELTA_SB real
Damping Factor DAMPING real
Drain Connector Inductance [H] LD real
Gate Connector Inductance [H] LG real
Source Connector Inductance [H] LS real
Nominal Drain-Source Voltage [V] VNOM real
Nominal Drain Current [I] INOM real