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The Nexxim Simulator

Nexxim® is Ansoft’s state-of-the-art circuit simulator for RF, analog, and mixed-signal designs. Nexxim combines transistor-level simulation accuracy, high execution speed, and robust capability to handle circuits with thousands of active and passive elements. Nexxim simulates in all three domains — DC, time, and frequency — from the same set of device models. Nexxim offers the following simulation tools:

• DC analysis calculates the circuit’s DC operating point and is the basis for other analyses.

• Transient analysis calculates the time-domain behavior of the circuit. Nexxim transient analysis incorporates a new, Ansoft-proprietary variable time-step integration formula and advanced error estimation and control. The analysis can include S-parameter input data files for accurate analysis in the time domain.

• Harmonic balance analysis calculates the frequency-domain responses of the circuit. Nexxim harmonic balance performs single-tone and multi-tone analysis that combines Krylov subspace methods with Ansoft-proprietary preconditioning algorithms to achieve fast convergence.

• Small-signal analyses (AC, linear network, DC noise) are based on the DC solution. Nexxim’s proprietary linear system solver is optimized for circuit simulation, and produces accurate answers without compromising speed. Nexxim also supports small-signal frequency analysis based on harmonic balance.

Nexxim provides a wide range of active, passive, and distributed device models. In addition to the classic variable sweeps of temperature, voltage, and current, Nexxim allows you to perform sweeps of any model or parameter in a circuit. Nexxim also supports both schematic and netlist circuit implementations. In addition, the Nexxim netlist format is HSPICE™-compatible, so any industry-standard system-design netlist can be easily imported for analysis.

For more information see Nexxim Simulator.


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