Feature Request: Extended Electrical Components for Analog Circuit Simulation

[s-celles]

Summary

This proposal suggests adding a set of commonly-used electrical components to ModelingToolkitStandardLibrary.Electrical that would significantly enhance analog circuit simulation capabilities. These components complement the existing IdealOpAmp and basic passive components.

Motivation

The current Electrical library provides excellent basic components (Resistor, Capacitor, Inductor, IdealOpAmp, Diode, etc.), but lacks several components essential for:

1. Realistic op-amp modeling: Finite gain, bandwidth limitations, slew rate, saturation
2. SPICE-like controlled sources: VCVS, VCCS, CCVS, CCCS (E, G, H, F elements)
3. Small-signal transistor analysis: Hybrid-π BJT and MOSFET models
4. Educational use: Step-by-step progression from ideal to realistic models

These components are standard in tools like SPICE, Modelica (MSL), and are essential for:

• Control systems design (op-amp stability analysis)
• Analog IC design education
• Mixed-signal simulation
• Feedback system analysis

Proposed Components

1. Op-Amp Models (TwoPort-based, consistent with existing IdealOpAmp)

Component	Description	Parameters	Use Case
OpAmpFiniteGain	Operational Amplifier with finite gain	A, Rin, Rout	DC gain error analysis
OpAmpGBW	Operational Amplifier with Gain-Bandwidth Product	A0, GBW, Rin	Frequency response, stability
OpAmpFull	Operational Amplifier "full" model	A0, GBW, Vsat, SR, Rin, Rout	Complete behavioral model

2. Controlled Sources

Component	Description	Parameters	SPICE Equivalent
VCVS	Voltage Controlled Voltage Source	G (voltage gain)	E-element
VCCS	Voltage Controlled Current Source	Gm (transconductance)	G-element
CCVS	Current Controlled Voltage Source	Rm (transimpedance)	H-element
CCCS	Current Controlled Current Source	α (current gain)	F-element

3. Two-Port Networks

Component	Parameters	Use Case
Gyrator	R	Inductor simulation in IC design
IdealTransformer	n (turns ratio)	Power electronics, isolation

4. Small-Signal Semiconductor Models (3-terminal)

Component	Parameters	Use Case
BJT_SmallSignal	gm, rπ, ro, Cπ, Cμ	AC analysis, amplifier design
MOSFET_SmallSignal	gm, rds, Cgs, Cgd	AC analysis, amplifier design

5. Linearized Components

Component	Parameters	Use Case
LinearizedDiode	Vd, Rd	Small-signal analysis

Questions for Maintainers

Scope: Should all these components be in ModelingToolkitStandardLibrary.Electrical, or would a separate package (e.g., ModelingToolkitAnalogLib.jl) be preferred?

Edit:
Dyad ElectricalComponents https://github.com/DyadLang/ElectricalComponents

[ChrisRackauckas]

@ven-k how do these compare to what ElectricalComponents has?

[s-celles]

Superseed by DyadLang/ElectricalComponents#1

[ven-k]

Cross-posting: DyadLang/ElectricalComponents#1 (comment)