simulating circuits using qucs, the quite universal circuit simulator doug reece, ak4ao may 22, 2015...

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Simulating Circuits Using QUCS, the Quite Universal Circuit Simulator

Doug Reece, AK4AOMay 22, 2015

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About QUCS

• Free software!• Provides CAD tools for drawing schematic

diagrams• Simulates the behavior of the circuit represented

by the schematic– DC– AC

• Frequency domain• Time domain

– Digital logic

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Uses for QUCS

• Students/hobbyists: Experiment with various types of electronic circuits without components and lab instruments

• Professionals: Analyze circuit performance before building

Caution: Models don’t capture all aspects of a real circuit: stray capacitance/inductance, hum pickup, etc.

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DC Circuit: Voltage Divider

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Voltage Divider with Parameter Sweep

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AC Circuit – Frequency Domain

AC Circuit – Time Domain

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Digital Logic Simulation

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Some other QUCS Features

• Libraries of real devices• Filter design • Attenuator design• Equations, including differential equations• Optimization

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Resources

• URL for software (MAC, Windows, various Linux flavors, source code) http://qucs.sourceforge.net/

Note: Windows version loads several programs• Tutorials:

http://qucs.sourceforge.net/docs.html