CST – Computer Simulation Technology

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Simulation Tasks

CST DESIGN STUDIO provides several types of Simulation Task. These tasks can be parameterized, enabled, disabled and re-ordered.

The following simulation tasks are available:

  • The S-Parameters Task is used to calculate the S-Parameter matrix of the system in order to design and optimize the matching network for RF systems, for filter synthesis and antenna array simulations.
  • The AC Task generates voltage and current curves as a function of the frequency for the ports and probes within the model. The AC Task can be linked using the Combine Results postprocessing step. This feature offers the possibility to calculating 3D fields for the excitations and circuits created in CST DESIGN STUDIO and for monitors defined in CST MICROWAVE STUDIO® Blocks. This feature is applied to both Farfields and Nearfield monitors.
  • The Operating Point (DC) Task is extremely useful for the characterization of linear and non-linear devices to predict the DC operation point on the characteristic I-V curve.
  • The Transient Task allows you to analyze the non-steady state behavior of a circuit or system. Since most of the blocks available are described by frequency domain data, equivalent circuits are automatically created during the execution of a transient simulation task. These equivalent circuits are generated by a model order reduction scheme including passivity enforcement. Using a pseudo-random bit sequence, the transient analysis produces an eye diagram for desired voltage and current probes.
  • The Transient Task can also run as a transient co-simulation, a unique feature which enables a coupled 3D Field EM/Circuit simulation (with CST MICROWAVE STUDIO) including linear and non-linear lumped components and circuit networks in a 3D full-wave simulation.
  • The Spectral Line Task performs a harmonic balance (HB) analysis, which solves for the steady state of a dynamic system and yields the Fourier coefficients of sinusoidal functions for given frequencies.
  • The Mixer Task provides the tools needed to analyze the behavior of mixers. A mixer provides a local oscillator (frequency fLO) either to convert an input signal at an intermediate frequency (fIF) to an output signal at a higher radio frequency (fRF) or vice-versa, depending if the mixer is either up-converting or down-converting.
  • The Amplifier Task calculates the properties and figures needed to characterize amplifiers. Therefore, linear simulations may be performed as well as nonlinear simulations depending on the results you want to obtain like S-Parameters, group delay, linear gain, stability factors, distortion, onput/output spectra, power and gain.

Further tasks are available for controlling simulation processes. With these, simulation tasks can be arranged into sequences, and parameter sweeps, optimization and post-processing can be carried out automatically. By combining these with the generalized Simulation Blocks, arbitrary solver types can be controlled from CST DESIGN STUDIO.

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