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about the sim of the common mode input range
u can use open loop op-amp with a reasonable input common mode voltage with AC=1 in positive input and the same input common mode voltage with a small differential offset voltage at negative input. Then u sweep the small offset voltage to get a...
get .ic file use iterative .op using smaller and smaller gmin, then use the .ic file when gmin is smaller than 1e-9. This can help to solve the problem
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