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In fact, the purpose of getting an infinite hold time is to get a defined range of capacitor charge and discharge voltages. I wanted the capacitor charge and discharge voltage to change linearly over time, which meant that a stable and consistent current needed to be supplied, but in the actual simulation attempt, assuming that a constant current source is generated by the current mirror circuit and the capacitor is charged and discharged, we found that the current fluctuates when the capacitor is added.