※ [本文轉錄自 Electronics 看板] 作者: pinns (努力向上中...) 看板: Electronics 標題: [請益] HSPICE問題.. 時間: Thu Feb 22 18:28:22 2007 小弟有兩個問題想請教各位高手... 1.以下是小地跑SPICE的時候 所出現的錯誤訊息.. 能否請高手指教一下,到底是什麼問題呢? 是不是收斂的問題...因為剛開始跑沒多久 跑到一半 會當掉.. lis檔如下.. _____________________________________ **error**: internal timestep too small in transient analysis time = 0.00000D+00; delta = 3.72529E-19; numnit = 112 **warning** no convergence, invoking autoconvergence ***** job aborted **warning** autoconvergence is invoked! trying method=gear from time=0 ***autoconvergence sets default value of the options: method= gear lvltim= 2 mbypass= 1.00 bypass= 0. bytol= 50.00u slopetol= 500.00m rmax= 2.00 **diagnostic** dc convergence failure, resetting dcon option to 1 and retrying **diagnostic** dc convergence failure, resetting dcon option to 2 and retrying. no convergence with standard algorithm, trying damped pseudo-transient **diagnostic** number of iteration exceeds min(7000, 20*itl1)= 4000 in pseudo tran process (converge=1 process). Usually this happens when the models are discontinous, or there are uninitialized bi-stable cells (flip-flop) in the circuit. By setting options dcon=-1 and converge=-1 you can disable auto convergence process. Retry the run, non-convergence diagnostics will provide useful information about the nodes and devices which can be used to work around the non-convergence problems. no convergence in damped pseudo-transient, trying gmath ramping method **diagnostic** op convergence successful with gmath ramping method **warning** This was a difficult operating point. You can speed up your simulation by specifying: .OPTION CONVERGE=4 Opening plot unit= 79 file=c:\flexlm\comp(dc).tr1 _________________________________________ 問題2. 小弟在跑比較器的電路 請問高手 怎麼跑出出 遲滯曲線呢?? 要使用.dc 還是.tran跑呢?? 怎麼跑呢 能否請高手指教 ... 拜託了 請指教... --

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