Dean Huang
74 lines
3.9 KiB
Python
74 lines
3.9 KiB
Python
"""
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opto_physics_model.py - Physics Model for Optocoupler (Poisson solver)
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"""
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from devsim import (
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node_solution, edge_from_node_model, edge_model, equation,
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get_parameter, set_parameter,
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interface_model, interface_equation,
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contact_node_model, contact_equation,
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node_model, element_from_edge_model
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)
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def setup_poisson(device, regions):
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"""Setup Poisson equation for dielectric regions."""
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for region in regions:
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node_solution(device=device, region=region, name="Potential")
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edge_from_node_model(device=device, region=region, node_model="Potential")
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# E = -dV/dx
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edge_model(device=device, region=region, name="ElectricField",
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equation="(Potential@n0 - Potential@n1) * EdgeInverseLength")
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edge_model(device=device, region=region, name="ElectricField:Potential@n0", equation="EdgeInverseLength")
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edge_model(device=device, region=region, name="ElectricField:Potential@n1", equation="-EdgeInverseLength")
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# D = eps * E
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edge_model(device=device, region=region, name="DField", equation="Permittivity * ElectricField")
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edge_model(device=device, region=region, name="DField:Potential@n0", equation="Permittivity * ElectricField:Potential@n0")
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edge_model(device=device, region=region, name="DField:Potential@n1", equation="Permittivity * ElectricField:Potential@n1")
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equation(device=device, region=region, name="PotentialEquation", variable_name="Potential",
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edge_model="DField", variable_update="default")
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try:
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element_from_edge_model(device=device, region=region, edge_model="ElectricField")
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except:
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pass
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def setup_interface(device, interface_name):
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"""Setup potential continuity at interface."""
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interface_model(device=device, interface=interface_name, name="continuousPotential", equation="Potential@r0 - Potential@r1")
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interface_model(device=device, interface=interface_name, name="continuousPotential:Potential@r0", equation="1")
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interface_model(device=device, interface=interface_name, name="continuousPotential:Potential@r1", equation="-1")
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interface_equation(device=device, interface=interface_name, name="PotentialEquation",
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interface_model="continuousPotential", type="continuous")
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def setup_contact(device, contact_name, bias_value=0.0):
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"""Setup Dirichlet boundary condition."""
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bias_name = f"{contact_name}_bias"
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set_parameter(device=device, name=bias_name, value=bias_value)
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contact_node_model(device=device, contact=contact_name, name=f"{contact_name}_bc", equation=f"Potential - {bias_name}")
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contact_node_model(device=device, contact=contact_name, name=f"{contact_name}_bc:Potential", equation="1")
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contact_equation(device=device, contact=contact_name, name="PotentialEquation", node_model=f"{contact_name}_bc")
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def setup_contacts(device, contact_map):
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"""Setup Dirichlet BC for multiple contacts."""
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for contact, region in contact_map.items():
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bias_name = f"{contact}_bias"
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set_parameter(device=device, name=bias_name, value=0.0)
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contact_node_model(device=device, contact=contact, name=f"{contact}_bc", equation=f"Potential - {bias_name}")
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contact_node_model(device=device, contact=contact, name=f"{contact}_bc:Potential", equation="1")
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contact_equation(device=device, contact=contact, name="PotentialEquation",
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node_model=f"{contact}_bc", edge_charge_model="DField")
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def setup_virtual_contact(device, region, bias_name):
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"""Setup virtual contact for entire region."""
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node_model(device=device, region=region, name="virtual_contact_bc", equation=f"Potential - {bias_name}")
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node_model(device=device, region=region, name="virtual_contact_bc:Potential", equation="1")
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equation(device=device, region=region, name="PotentialEquation", variable_name="Potential",
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node_model="virtual_contact_bc", variable_update="default")
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