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SIMBA 25.11 Release Notes

Welcome to SIMBA 25.11!

This update introduces new models, major SIMBA Online updates, various GUI enhancements and improved SPICE support.

New models

SIMBA 25.11 now includes new models and introduces important changes to several existing models, such as:

  • Enhanced continuous PID block: The Continuous PID model now includes new features: saturation, two anti-windup methods, and a derivative low-pass filter.
  • New discrete PID block: a Discrete PID model based on the continuous version, designed to operate in the z-domain.
  • Enhanced PWM control model: The PWM block now includes various modulation methods: SPWM, MIN-MAX (carrier SVM), DPWM1, DPWMMIN, DPWMMAX, and THIPWM.
  • New Operational amplifier: Operational amplifier now supported in the power solver, available in the Electrical/Semiconductors library.
  • Various new control models: Ramp source, Compare to constant and Relational Operator models are now available.
  • Detailed P-Channel MOSFET (datasheet): see documentation
  • Voltage controlled switch: New voltage controlled switch where the state is controlled by the voltage difference between control pins.

Nonlinear magnetic modeling

SIMBA 25.11 now includes enhanced capabilities to capture the nonlinearity in the magnetic core. This feature enables to simulate the magnetic saturation using user defined nonlinear BH data. The nonlinear core device supports two BH data types: Table and Function.

Table: The Table option uses a BH point array to represent the core’s nonlinearity.

Function: The Function option represents the BH curve using fitting equations defined by a few user-specified parameters, such as the magnetic flux density at the knee point, the permeability before saturation and the permeability after saturation. In the Function option, two fitting functions, coth and atan are available.

Nonlinear magnetic modeling Nonlinear magnetic modeling

Simba Online updates

SIMBA Online now supports most of the latest SIMBA features, such as:
- the latest .jsimba file format,
- subcircuit support,
- a simple publish-and-share flow, where users can upload a .jsimba file (max 5 MB) and receive a public link.

Visitors without an account see Viewer mode, while signed-in users with a valid SIMBA license have access to Full mode.

Python API improvements

  • New "Circuit Builder" feature: users can now define a list of devices, connections, and contraints, and this class will automatically draw the circuit using classical electrical rules. 
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    #%% Create Circuit using CircuitBuilder
builder = CircuitBuilder(design.Circuit)
Vin = builder.AddDevice("DC Voltage Source");
Vin.Name= "Vin"
Vin.Voltage = "12"
Q1  = builder.AddDevice("Ideal MOSFET with Diode");
Q1.Name = "Q1"
...

# Netlist
builder.AddConnection(Vin.P, Q1.Drain)
builder.AddConnection([Q1.Source, D1.Cathode, L1.P])
...

# Layout constraints
builder.Constrain([Vin, C1, Rload, D1], CircuitBuilder.DeviceOrientation.Vertical)
builder.Constrain([Vin, Q1, D1, L1, C1, Rload], CircuitBuilder.LayoutDirection.LeftToRight)
builder.Constrain([Vin, C1, Rload], CircuitBuilder.Align.SameRow)
...

# Build the circuit
builder.Build()

Circuit Builder

  • "Save as SVG" option added: use SaveAsSvg(file_path) to export the current circuit as an SVG file. 
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    from aesim.simba import DesignExamples 
import os 
flybackConverter = DesignExamples.DCDC_Flyback() 
svg_file_path = os.path.join(r"C:\\temp", "flyback.svg") 
flybackConverter.Circuit.SaveAsSvg(svg_file_path)

Offline license mode

SIMBA now supports offline license activation: see documentation

Additional GUI Improvements

  • Device preview in the library view has been improved, especially for low-resolution screens.
  • Various fixes and optimisations.

Enhanced SPICE Support

Enjoy improved stability, performance, and reliability of SPICE-imported models with fewer syntax-related issues and crashes.

Solver fixes and enhancements

SIMBA 25.11 now includes enhanced capabilities to manage interactions between the control and power solvers. This is particularly useful for simulations involving diodes and two-level control blocks (standard and hysteresis comparators).

Thank you for using SIMBA—we're committed to enhancing your simulation experience. We look forward to your continued feedback!