How can Qucs Electronic simulator software can be helpful for ciruit simulation and how is it different from other simulators

What is an Electronic Circuit simulation Software

A circuit simulator is used for the evaluation of the circuit performance, due to the complexity of the modern integrated circuits, in order to evaluate the circuit performance computer-aided circuit analysis is needed and it can provide details about circuit performance which would be almost impossible to obtain with the lab prototype measurements

What are the functions of an Electronic circuit simulation software

  • Circuits can be designed according to circuit parameters
  • Evaluation can be done on the effect of non-linear elements on the circuit parameters
  • Without any wave analyzer Fourier analysis can be done
  • Noise and signal distortion can be checked without using any expensive measuring instruments
  • Performance improvements or degradation can be evaluated
  • It can evaluate the effects of variation in elements such as resistors, transistor, and transformer

What is QUCS

Quite universal simulator software is a circuit simulation software which is developed on GNU/Linux. The users can modify it for their purpose and it should be done in public

Available for operating systems such as

  • GNU/Linux
  • Windows
  • Free BSD
  • Mac OS
  • Net BSD
  • Solaris

Source code can be seen on the homepage which can be used to install and build the software if the software is successfully installed on the system it can be started by issuing the #qucs

It is a multilingual program so depending upon the system language settings the graphical user interface will appear in a different language

The appearance of the qucs can be changed by the step


Qucs Application setting


Qucs is an integrated circuit simulator, it is a circuit simulator with graphical user interphase. It can do all kinds of circuit simulations like DC, AC, harmonic balance and noise analysis

Qucs Analog component modeling and simulation block diagram

Qucs Tool suit

Qucs has several programs which can interface each other through the graphical user interface they are

  • GUI – it can be used to create schematics, setup simulation results and writing VHDL code …
  • Backend analogue simulator- it is a command line program which is run by GUI it takes a netlist and checks for errors the required simulation action will be performed and it produces the datasheet
  • Text editor- it is used to display the netlist and simulation logging information and it can also edit files
  • Filter synthesis application- it can design various types of filters
  • Transmission line calculator- it can design and analyze various types of transmission lines
  • Component library – it can be used to make components like the transistor, diodes… for the circuit designing
  • Attenuator synthesis – it can be used to design various types of passive attenuators

Improving circuit simulation characteristics by adding Equations

Adding component value calculation by the equations to the circuit simulator will increase the design and simulation characteristics which would be more than the other simulators

Drawing digital schematics

  • The component which is used to draw the digital circuit schematic is the digital components listed in the digital components icon window
  • Matrix approach can be used to draw the digital schematics and it could make the checking of the circuit schematic error than in case of diagrams which have wire
  • The input and the output wires must be named if the signal wires are not named the Qucs will give them different arbitrary names and this will make checking errors in large circuit much more difficult

Introduction to Qucs sub-circuit

Simulation is mostly done with the help of the sub-circuits by this an electronic system can be divided into a number of smaller self-contained functional blocks universal macro-models can be built by passing parameters to sub-circuits and by this modeling of an operational amplifier and the integrated circuit is possible