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feat: Use proper MOSFET model for SPICE conversion #29

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Merged
ShiboSoftwareDev merged 1 commit into from
Dec 7, 2025
Merged

feat: Use proper MOSFET model for SPICE conversion #29

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33 changes: 15 additions & 18 deletions lib/circuitJsonToSpice.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import { VoltageSourceCommand } from "./spice-commands/VoltageSourceCommand"
import { BJTCommand } from "./spice-commands/BJTCommand"
import { DiodeCommand } from "./spice-commands/DiodeCommand"
import { InductorCommand } from "./spice-commands/InductorCommand"
import { MOSFETCommand } from "./spice-commands/MOSFETCommand"
import { VoltageControlledSwitchCommand } from "./spice-commands/VoltageControlledSwitchCommand"
import type {
AnyCircuitElement,
Expand Down Expand Up @@ -361,33 +362,29 @@ export function circuitJsonToSpice(
const sourceNode =
nodeMap.get(sourcePort?.source_port_id ?? "") || "0"

const channel_type = component.channel_type
// For 3-pin MOSFETs, substrate is typically connected to source
const substrateNode = sourceNode

let positiveControl = gateNode
let negativeControl = sourceNode
if (channel_type === "p") {
positiveControl = sourceNode
negativeControl = gateNode
}
const channel_type = (component as any).channel_type ?? "n"
const mosfet_mode = (component as any).mosfet_mode ?? "enhancement"

const modelType = `${channel_type.toUpperCase()}MOS`
const modelName = `${modelType}_${mosfet_mode.toUpperCase()}`

const modelName = "ENH_SW"
if (!netlist.models.has(modelName)) {
netlist.models.set(
modelName,
`.MODEL ${modelName} SW(Ron=0.1 Roff=1e9 Vt=2.5 Vh=0.1)`,
)
netlist.models.set(modelName, `.MODEL ${modelName} ${modelType}`)
}

const switchCmd = new VoltageControlledSwitchCommand({
const mosfetCmd = new MOSFETCommand({
name: component.name,
positiveNode: drainNode,
negativeNode: sourceNode,
positiveControl,
negativeControl,
drain: drainNode,
gate: gateNode,
source: sourceNode,
substrate: substrateNode,
model: modelName,
})

spiceComponent = new SpiceComponent(component.name, switchCmd, [
spiceComponent = new SpiceComponent(component.name, mosfetCmd, [
drainNode,
gateNode,
sourceNode,
Expand Down
4 changes: 2 additions & 2 deletions tests/examples/boost-converter.test.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -17,12 +17,12 @@ test(
expect(spiceString).toMatchInlineSnapshot(`
"* Circuit JSON to SPICE Netlist
.MODEL D D
.MODEL ENH_SW SW(Ron=0.1 Roff=1e9 Vt=2.5 Vh=0.1)
.MODEL NMOS_ENHANCEMENT NMOS
LL1 N1 N2 1
DD1 N2 N3 D
CC1 N3 0 10U
RR1 N3 0 1K
SM1 N2 0 N4 0 ENH_SW
MM1 N2 N4 0 0 NMOS_ENHANCEMENT
Vsimulation_voltage_source_0 N1 0 DC 5
Vsimulation_voltage_source_1 N4 0 PULSE(0 10 0 1n 1n 0.00068 0.001)
.END"
Expand Down
4 changes: 2 additions & 2 deletions tests/examples/buck-converter.test.tsx
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Expand Up @@ -12,9 +12,9 @@ test(

expect(spiceString).toMatchInlineSnapshot(`
"* Circuit JSON to SPICE Netlist
.MODEL ENH_SW SW(Ron=0.1 Roff=1e9 Vt=2.5 Vh=0.1)
.MODEL PMOS_ENHANCEMENT PMOS
.MODEL D D
SM1 N2 VP_IN VP_IN N1 ENH_SW
MM1 N2 N1 VP_IN VP_IN PMOS_ENHANCEMENT
DD1 0 N2 D
LL1 N2 VP_OUT 10
CC1 VP_OUT 0 10U
Expand Down