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hspice gmindc 在 [問題] HSPICE simulation 問題(收斂) - 看板Electronics - 批踢踢 ... 的推薦與評價


作者wwwok (勇敢的堅持下去)
看板Electronics
標題Re: [問題] HSPICE simulation 問題(收斂)
時間Mon Oct 27 15:45:52 2008

藉此標題想請問一下

那有關於'pseudo transient'的問題呢？

是不是也是收斂性的問題阿

我在模擬振盪器時

幾乎都會碰到

上網查了一下 加上一行.option gmindc=(3.920E-06)

就可以振盪出來

想請問一下板上的大大

這行指令的意思以及若是需要加上這行指令才能振盪的電路

是不是代表設計不良呢？

多謝各位大大了




※ 引述《tenshon (關心)》之銘言：
: ※ 引述《pinns (邁向新人生...)》之銘言：
: : Q:
: : 電路是LDO..
: : 問題則是 跑TRANS跑到一半
: : 錯誤訊息是
: : "internal time step too small in transient"
: : 感覺是收斂的問題..
: : 不過我有試過.ic
: : 也改過trans的時間看看 發現都沒辦法 跑到一半都會跳出錯誤.
: : 能否請先進指導一下 感恩..
: 翻了一下hspice的menu
: In transient analysis, the error message “internal time step too small”
: indicates that the circuit failed to converge. The convergence failure
: might be due to stated initial conditions that are not close enough to
: the actual DC operating point values.
: 以前我也遇過這個error message
: 找出來的原因曾有:電路沒接好(floating)
: 整合sub-circuit時，直流偏壓跑掉
: time step調太小
: 我在除錯時 第二個原因比較常看到

--
只有在被愛的時候 才會發現自己是多麼的重要
只有在愛一個人的時候 才會發現原來可以這麼在乎一個人

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※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.124.32.60
推 paullai:印象中模擬震盪電路有些要有初值才能跑 10/27 17:22
→ paullai:(實作就不用) 10/27 17:23
→ paullai:詳細的我不太記得 不過簡單說就是模擬跟實際狀況有點差距 10/27 17:23
推 pow:gmindc就是 在DC時在每一個點加上一個電阻（1/gmin） 10/27 19:40
→ wwwok:可以請問一下 為什麼加上電阻就會震盪嗎? 10/29 11:15
→ wwwok:那我在畫layout時 必須也要把這些電阻畫上去嗎 10/29 11:15
→ wwwok:多謝兩位p大的回答唷^^ 10/29 11:16
推 pow:加電阻有時候是要讓他比較好收斂 10/30 06:10
推 hisanick:我是習慣給 出值.. 11/27 19:10






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hspice gmindc 在 [問題] HSpice的收斂問題- 看板Electronics - PTT網頁版 的推薦與評價

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hspice gmindc 在 Re: [問題] HSPICE問題請教 的推薦與評價

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hspice gmindc 在 HSPICE/sram2.lis at master - GitHub 的推薦與評價

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