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So, what you mean is, the problem is that the simulated current source is not the ideal current source, right?

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However, for the simulation, theoretically, both the NPN transistor and the PNP transistor can maintain the same characteristics, and the capacitance size is not within the setting range of the simulation.

The holding time is not important, I think the important thing is to ensure that the capacitor charge current is constant.

I would like to get a capacitor with a charge and discharge cycle of 10KHz.