2.Time to start saving data：开始保存数据的时间。如果指定了这个时间，仿真会等到这个时间点才开始记录数据。比如，仿真时长设置1s，Time to start saving data设置500m，运行仿真，0~500ms的数据是不记录的，在波形显示窗口看不到这段时间的波形；等运行到500ms开始有波形了，一直到1s。
4.Start external DC supply voltages at 0V：如果勾选，原理图中放置的直流电压源的开始电压为0V；不勾选的话设置多少V，仿真开始的零时刻就是多少V。
5.Stop simulating if steady state is detected：系统检查输入开关测试重复时，停止仿真，只保存最后10个开关次数的计算数据；
6.Don’t reset T=0 when steady state is detected：计算全部的数据；
7.Step the load current source：使用电源负荷时，在负荷的电流逐步变化的情况下进行检测，每次到达稳定状态就会向下一个负荷电流值移动；
8.Skip initial operating point solution（UIC选项）:用个元器件所拥有的值（或给予元器件的初期条件）即作为仿真执行的初始值。如果勾选了这一项，一般要通过【.ic】命令指定各节点的初始电压，电感的初始电流，在.tran语句的最后添加UIC （use initial conditions），有助于改善瞬态分析的收敛性。
Use Initial Conditions. Normally, a DC operating point analysis is performed before starting the transient analysis. This directive suppresses this initialization. The initial conditions of some circuit elements can be can be specified on an instance-per-instance basis. Uic is not a particularly recommended feature of SPICE. Skipping the DC operating point analysis leads to a nonphysical initial condition.
For example, consider a voltage source connected in parallel to a capacitance. The node voltage is taken as zero if not specified. Then, in the first time step, an infinite current is required to charge the capacitor. The simulator cannot find a short enough time step to make the current nonsingular, and a "time step too small convergence fail" message is issued.
案例：相同模型参数，上图含有.uic 瞬态分析，下图没有.uic.
发表于 2021-7-18 08:50:39
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