Comments on: S-Param: Quality checklist http://www.spisim.com/blog/s-param-quality-checklist/ EDA Experts in Signal, Power Integrity and Simulation Wed, 08 May 2019 20:21:21 +0000 hourly 1 https://wordpress.org/?v=5.3.2 By: S-Param indicators: ILFitatNq, ILD, ICN, ICR, IMR, INEXT, PQM, CQM... | SPISim: EDA for Signal Integrity, Power Integrity and Circuit Simulation http://www.spisim.com/blog/s-param-quality-checklist/#comment-16895 Wed, 08 May 2019 20:21:21 +0000 http://www.spisim.com/?p=1719#comment-16895 […] we have written a post [LINKED HERE] detailing how these metrics are calculated. Interested readers may also wait for upcoming P370 spec. […]

]]> By: SERDES 通道分析三部曲 | SPISim[使必信科技]: 信號完整性、電源完整性暨電路擬真軟體 http://www.spisim.com/blog/s-param-quality-checklist/#comment-3172 Sun, 08 Apr 2018 18:57:44 +0000 http://www.spisim.com/?p=1719#comment-3172 […] 通道分析第一步的是對通道做時域仿真以得到其響應,如前所說我們也把TX/RX的類比前端包括在仿真的原理圖或網表裡,並以全部響應會是LTI為假設。如果現有欲分析的通路是佈線後的結果,則第三方的全波場解程式則為必需, 因為諸如VIA或連接器等都需以全波的形式場解(field solve)才能得到精確的描述;broadband spice也常是需要的, 因其可將場解出的頻域轉成如RLC/EFGH的仿真器內建元件而於時域上使用;若通道是為佈線前的分析, 則這些Via/Connector的模型仍為必需但傳輸線的部份則可以現有元件代替。如果S參數會一同參與仿真的話則這裡沒做更多說明的部份、即藏在魔鬼裡的細節、包括了調適S參數以期為passive, causal, symmetric and asympotic  以及最終將單端的S參數轉成差分的形式。當所有的模型都就緒之後, 則可到我們的[SPISim_IBIS 程式]端並把IBIS 轉成免費仿真器可支援的格式: […]

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