仿真问题

airbirds

仿真时，不改变任何条件，包括电路和仿真参数，有时仿真是对的，但有时却会出现如下问题，请问如何解决？？

Warning from spectre at time = 5.07809 ns during transient analysis `tran'.
    WARNING (CMI-2683): I0.PM46.mint: The `bulk-drain' junction reverse bias voltage (-15.0527 V) exceeds `VjdmRev' = -15.0395 V.  The results are now incorrect because the junction current model has been linearized

Zero diagonal found in Jacobian at `I0.NM52.ddnw2:int_a' and `I0.NM52.ddnw2:int_a'.

Error found by spectre at time = 5.07809 ns during transient analysis `tran'.
    ERROR (SPECTRE-16192): No convergence achieved with the minimum time step specified.  Last acceptable solution computed at 5.07809 ns.

The values for those nodes that did not converge on the last Newton iteration are given below.  The manner in which the convergence criteria were not satisfied is also given.
            Failed test: | Value | > RelTol*Ref + AbsTol

Top 10 Solution too large Convergence failure:
    I(I0.V1:p) = 2.85996 mA, previously 2.59771 mA.
        update too large:  | -77.9734 uA | > 545.767 nA + 1 pA
    I(I0.V2:p) = 4.48617 mA, previously 4.0892 mA.
        update too large:  | -118.023 uA | > 857.537 nA + 1 pA
    I(V1:p) = 15.8957 mA, previously 14.5211 mA.
        update too large:  | -408.673 uA | > 3.04168 uA + 1 pA
    I(V18:p) = -16.1473 mA, previously -14.7638 mA.
        update too large:  | 411.381 uA | > 3.09111 uA + 1 pA
    I(I0.V0:p) = -21.9385 mA, previously -20.1738 mA.
        update too large:  | 524.668 uA | > 4.21123 uA + 1 pA
    I(I0.V3:p) = 19.9795 mA, previously 18.3808 mA.
        update too large:  | -475.291 uA | > 3.83603 uA + 1 pA
    I(I0.V4:p) = 4.19634 mA, previously 3.8686 mA.
        update too large:  | -97.438 uA | > 806.494 nA + 1 pA
    I(V19:p) = 150.868 uA, previously 144.577 uA.
        update too large:  | -1.87054 uA | > 29.5445 nA + 1 pA
    I(V30:p) = 100.782 uA, previously 98.1097 uA.
        update too large:  | -792.108 nA | > 19.8891 nA + 1 pA
    V(I0.NM38.bg) = 5.75043 mV, previously 5.57549 mV.
        update too large:  | -52.0054 uV | > 1.13259 uV + 1 uV
Top 10 Residue too large Convergence failure:
    V(I0.PM46.mint:int_d) = -12.807 V, previously -12.7333 V.
        residue too large: | -73.3721 kA | > 6.92901 kA + 1 pA
    V(I0.PM46.mint:int_g) = 861.969 mV, previously 861.564 mV.
        residue too large: | 73.3628 kA | > 13.6254 kA + 1 pA

zhang_y_w

你的问题解决了么？我也遇到同样的问题，求帮助

xiulitunjin

电容、电感连接的电压电流源限一下最大值

czhao小不点

我也遇到了这个问题，你这是怎么解决的？

afcy003

同样的问题，同样的参数，之前还能正常仿真，然后就报错……楼主解决这个问题了么

whulaisla

楼主解决了吗？求指导

qqpp321ll

精度问题。在仿真器-simulation-option-analog，把tolerance改大一点

Yi_Huo

qqpp321ll 发表于 2020-5-19 13:54
精度问题。在仿真器-simulation-option-analog，把tolerance改大一点

问一下您改多大合适呢

qqpp321ll

Yi_Huo 发表于 2021-12-15 15:43
问一下您改多大合适呢

比默认值小一个数量级

Yi_Huo

qqpp321ll 发表于 2021-12-23 13:54
比默认值小一个数量级

明白了，谢谢您！