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Agilent announces a breakthrough in high-frequency SPICE simulation technology

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Agilent Technologies Inc. has announced a breakthrough in high-frequency SPICE simulation technology. The simulation technology is part of the Advanced Design System's new Signal Integrity Designer Premier software suite, providing the high-speed digital board designer with accurate time-domain response.

According to Agilent, measured or modeled interconnects at data rates exceeding 1 Gbps are best represented in frequency domain, and it is difficult for pure time-domain simulators to predict a correct response. To address this challenging technical problem, Agilent has developed a new convolution simulator that can automatically enforce passivity on S-parameter models, and can determine, accurately, the causal time domain response, which represents the original S-parameter data.

Agilent's Advanced Design System EDA software offers a complete set of front-to-back simulation and layout tools and instrument links for RF and microwave IC design in a single, integrated design flow. Agilent's Advanced Design System EDA software’s signal integrity solution for high-speed digital design is made possible through its unique co-simulation technology. The software can model entire serial data links, including interconnects, pre-emphasis and adaptive equalization, in the presence of non-linear driver and receiver models.

Signal Integrity Designer Premier also provides two additional capabilities that are important for accurate high-speed digital design:

  • a new, fully integrated set of IBIS (I/O Buffer Information Specification) models for single-ended and differential components such as sources, buffers and terminations; and
  • a broadband SPICE model generator.

IBIS models describe the behaviour of circuits when triggered by waveforms. IBIS models eliminate the need to obtain the often proprietary transistor-level details of components. The broadband SPICE model generator automatically processes frequency-domain data produced by electromagnetic structure simulators such as Agilent's Momentum, a three-dimensional planar electromagnetic simulator and Electromagnetic Design System (EMDS), Agilent's full three-dimensional EM simulator, or by measuring with a vector network analyser to create models that are accurate over a broad band of frequencies and are usable by a time-domain simulator.

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