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Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. If you have many questions of PCB Design, please come here!

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The Simulation Technology Helps High-Speed PCB Design Reply 2017-02-09 23:49:21
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philip lambert

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Achieving accurate response in the time domain for pcb interconnects at data rates of more than 1 Gb/s is no mean feat for time-domain simulators — but Agilent Technologies Inc. is claiming a breakthrough in high-frequency Spice simulation technology in the form of its Signal Integrity Designer Premier suite, which is part of the Advanced Design System.
To address the challenging technical problem of time-domain accuracy at high data rates, Agilent has developed a convolution simulator that can automatically enforce passivity on S-parameter models. The simulator can accurately determine the causal time-domain response, which represents the original S-parameter data.
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 behavior of circuits when triggered by waveforms. They 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 3D planar electromagnetic simulator, and Electromagnetic Design System (EMDS), Agilent's full 3D EM simulator, or by measuring with a vector network analyzer to create models that are accurate over a broad band of frequencies and are usable by a time-domain simulator.
Signal Integrity Designer suites are expected to be available in February 2007, with prices starting at approximately $25,000. For more information, visit Agilent Technologies.

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Stephane Cadinot

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