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OPA690运放构成方波发生电路,方波的低电平的问题

Other Parts Discussed in Thread: OPA690, OPA836, THS4304, OPA355

从仿真上看,输出的方波低电平近似为零,但是按照图中参数搭出的电路进行测试,发现方波的低电平幅值较大,约为1V左右,这个方波是要输给后端的数字器件,1V的低电平会让数字器件误动作

现在有什么方法可以将方波的低电平尽量降低,最好降到0.5V以下