8. Solver
8.1. Solver
DEVSIM uses Newton methods to solve the system of PDE’s. All of the analyses are performed using the devsim.solve().
8.2. DC analysis
A DC analysis is performed using the devsim.solve().
solve(type="dc", absolute_error=1.0e10, relative_error=1e-7 maximum_iterations=30)
8.3. AC analysis
An AC analysis is performed using the devsim.solve(). A circuit voltage source is required to set the AC source.
8.4. Noise/Sensitivity analysis
An noise analysis is performed using the devsim.solve() command. A circuit node is specified in order to find its sensitivity to changes in the bulk quantities of each device. If the circuit node is named V1.I. A noise simulation is performed using:
solve(type="noise", frequency=1e5, output_node="V1.I")
Noise and sensitivity analysis is performed using the devsim.solve(). If the equation begin solved is PotentialEquation, the names of the scalar impedance field is then:
V1.I_PotentialEquation_realV1.I_PotentialEquation_imag
and the vector impedance fields evaluated on the nodes are
V1.I_PotentialEquation_real_gradxV1.I_PotentialEquation_imag_gradxV1.I_PotentialEquation_real_grady(2D and 3D)V1.I_PotentialEquation_imag_grady(2D and 3D)V1.I_PotentialEquation_real_gradz(3D only)V1.I_PotentialEquation_imag_gradz(3D only)
8.5. Transient analysis
Transient analysis is performed using the devsim.solve(). DEVSIM supports time-integration of the device PDE’s. The three methods are supported are:
BDF1
TRBDF
BDF2