Quite Universal Circuit Simulator – Qucs

An integrated circuit simulator. Sketch the circuit and simulate the large-signal, small-signal and noise behavior of the circuit. After that simulation has finished you can generate and display the simulation results on the presentation output page.

Quite Universal Circuit Simulator – Qucs

The Qucs GUI is well advanced and allows setting up schematics and presenting simulation results in various types of diagrams. DC, AC, S-parameter, noise and transient analysis is possible, mathematical equations and use of a subcircuit hierarchy (with parameterised subcircuits) are available. Qucs can also import existing SPICE models for use in your simulations.

Quite Universal Circuit Simulator - Qucs

EDA and Technical Software Components

  • ADMS — Verilog-A translator
  • ps2sp.pl — A SPICE preprocessor
  • ASCO (A SPICE Circuit Optimizer)
  • FreeHDL — for VHDL digital simulations
  • Icarus Verilog — for Verilog-HDL digital simulations
  • GNU Octave — for Octave interactive interface
GNU Octave is a high-level interpreted language, primarily intended for numerical computations. It provides capabilities for the numerical solution of linear and nonlinear problems, and for performing other numerical experiments. It also provides extensive graphics capabilities for data visualization and manipulation.

Multisim from National Instruments

An industry-standard SPICE simulation environment from NI. An excellent yet easy to use tool for students and new design engineers too. It helps you in the design process, creating your first prototype and PCB.

Multisim from National Instruments

Learning and Testing circuits by simulation and checking out the best fit for your PCB.Getting your projects done right the first time without many trials.

Multisim from National Instruments

This application notes introduces different applications that include various semiconductor devices, simulated and validated in Multisim

Introduction to Simulation and Analysis of Semiconductor Applications

Features Include

Enhance Simulation with 26,000+ Accurate Devices Devices from Maxim, Infineon, NXP, ON Semiconductor, and Analog Devices add to the library of the latest SPICE models to evaluate design choices.

Complete Senior Design Projects With NI myRIO Support Use preconfigured NI myRIO NI miniSystem templates and LabVIEW co-simulation to develop advanced controls, robotics, and measurement projects.

Learn Digital Logic With Digilent FPGA Board Support Export digital logic schematics from Multisim in raw VHDL format to target a suite of FPGA digital teaching platforms.

Berkeley Design Automation – Analog and RF SPICE

“Berkeley Design Automation (BDA) is the electronic design automation (EDA) industry leader in next-generation analog, RF, and mixed-signal integrated circuit (IC) verification.”

Berkeley Design Automation – Analog and RF SPICE (wayback)

Berkeley Design Automation - Analog and RF SPICE

(Update – BDA now part of Mentor Graphics)

Analog FastSPICE is based on Precision Circuit Analysis technology. This technology is a proprietary combination of innovative applied mathematics and optimized numerical analysis.

Analog FastSPICE AFS Mentor Graphics

The Analog FastSPICE (AFS) Platform is the world’s fastest nanometer circuit verification platform for analog, RF, mixed-signal, and custom digital circuits.

For silicon-accurate characterization it includes the industry’s only comprehensive full-spectrum device noise analysis and a high-productivity Analog Characterization Environment.

National Instruments – Test and Measurement

For the past 30 years, National Instruments has been a technology pioneer and leader in virtual instrumentation – a revolutionary concept that has changed the way engineers and scientists in industry, government, and academia approach measurement and automation.

LabVIEW, Data Acquisition, Modular Instruments, PXI, Programmable Automation Controllers.
Here is a page from an old NI Catalog. RS-232 Tutorial of NI. drag-drop image to read.

National Instruments – Test and Measurement

One which is useful for beginners is the LabVIEW Student Edition – LabVIEW easily connects to any device be it hardware or outside applications like Microsoft Excel. You can depend on this seamless development experience as you write your program.

eCircuit Center – Spice Schematics

“The goal is a site where the learning of electronics is hands-on and fun. And the SPICE circuit simulator is a great software tool to achieve that goal. It hit me the first time I used SPICE – simulating is fun! And because it’s easy to use, I’ve spent a lot of time building and exploring circuits.” – Rick

eCircuit Center – Spice Schematics

SPICE is capable of performing both AC (frequency) Analysis and Transient (time) Analysis. SPICE also performs a number of other analyses like DC, Sensitivity, Noise and Distortion.

SPICE Basics, SPICE Commands, Circuit Collection

“At the core of the function generator is a triangle wave generator. How do you generate a triangle wave? The most common way is to get a capacitor and then alternate charging it and discharging it. But how to you get a nice linear ramp across the capacitor?”

eCircuit Center - Spice Schematics

Triangle and Square-Wave Generator

Simulation Circuit Examples –

  • Programmable Gain Amplifier (PGA) Op Amp
  • Single-Supply AC Inverting Amplifier
  • Instrumentation Amp (3 Op Amp)
  • Sensor Bridge with Current Bias
  • The PID Controller
  • Pulse Width Modulation
  • Precision Half-Wave Rectifier

SPICE Analog Simulation Program TINA TI

TINA is an easy-to-use, but powerful, circuit simulation program based on a SPICE engine. TINA-TI is a fully functional version of TINA, loaded with a library of TI macromodels plus passive and active models.
TINA-TI’s new version 7.0 has changes from Version 6.0 in the following areas:

SPICE Analog Simulation Program TINA TI

SPICE Analog Simulation Program TINA TI

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages and waveforms. TINA’s schematic capture is truly intuitive-a real “quickstart.”

  • Provides support for switching power supply devices.
  • No limit to circuit size.
  • More SPICE models and example circuits included.
  • SMPS simulation capability.
  • Circuits developed in TINA-TI 7.0 will work with TINA Industrial version 7.

Application Schematic categories include:

  • Audio Op Amp Filters, Microphone Pre-Amplifiers
  • Control Loop for PI Temp Control and Current Loop 4-20mA
  • Signal Conditioner – Thermistor, Resistive Bridge, Capacitive Bridge
  • Reference Designs from device evaluation modules for SMPS Devices