![]() In this chapter the Qucs-S RF capabilities are introduced and described. HB is particularly suited to the simulation of analogue RF and microwave circuits. Or frequency modulated communications signals. Transient analysis can take a long time to reach a steady state solution due to widely differing frequency signals present in a circuit, for example amplitude In practice the HB simulation technique is often more efficient than transient analysis, particularly in situations where ![]() This source can be a large signal AC signal. Of circuit voltages and currents when signals reach a steady state, following excitation with an external signal source. In HB simulation, the voltages and currents in a nonlinear circuit are represented by truncated Fourier series. HB is a circuit simulation method that solves for the steady state solution of nonlinear circuits in the frequency domain. Via the spice4qucs extension, makes the Qucs-S version of Qucs a useful addition to the GPL RF circuit simulation scene. These RF simulation techniques, when coupled with the fact that Ngspice, Xyce and SPICE OPUS support small signal AC two port network analysis ![]() Simulation (Xyce) and a transient simulation shooting method (SPICE OPUS) for large signal AC steady state simulation. These include single tone and multi-tone HB With features which are designed specifically for RF circuit simulation. In contrast to SPICE 3f5 the Ngspice, Xyce and SPICE OPUS GPL simulators have been extended At RF, Qucs implements models and analysis features not included in the traditional SPICE 2g6Īnd 3f5 circuit simulators. The performance of high frequency circuits. Microstrip and coplanar technology components, making the package a good choice for investigation Interested in RF circuit design Qucs is distributed with a selection of built-in RF component models, including Package with good high frequency analysis capabilities like small signal AC two port and multi-port S parameterĪnalysis, noise analysis and rudimentary single tone Harmonic Balance (HB) circuit simulation. Today, Qucs has become a relatively stable simulation RF circuit simulator which was freely available to all interested in RF and microwaveĬircuit and system design. The original motivation behind the development of Qucs was the need for an open source ![]() Qucs-S/Octave circuit simulation and device parameter extraction interface.The SPICE OPUS large signal AC steady state transient shooting method.Multi-tone Large signal AC HB simulation.Single tone large signal AC Harmonic Balance simulation.Small signal AC two port network simulation/analysis.RF simulation with Ngspice, Xyce and SPICE OPUS.Verilog-A compact semiconductor device modelling.Introduction to mixed analogue/digital simulation.XSPICE user written device models and library.Qucs and SPICE simulation models that work with Ngspice, Xyce and SPICE OPUS.Ngspice, Xyce and SPICE OPUS post-simulation data processing with Qucs-S and Octave.More advanced circuit simulation techniques.Device and component modelling with algebraic equations.Spice4qucs subcircuits, macromodels and device libraries.Basic Ngspice, Xyce and SPICE OPUS simulation.
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