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Why is this circuit's transient response settling twice

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SiliconWizard:
At this point, I'm definitely suspecting either the input signal generation, or the power supplies, or both.

Could it be that the OP is actually testing the transient behavior of this circuit by switching on the power supplies instead of testing that when those are fully stabilized? Sorry if that sounds silly and like I'm not trusting the OP, but it's just that it could well explain the behavior.

nikola22:
It was similar to that SiliconWizard! Im a dope, I was using an autoranging multimeter, and the impedance was changing mid-transient!!! Got it worked out now! Thanks for all the help!

SiliconWizard:
Glad you sorted it out. And yes, auto-ranging multimeters can be a trap. Likewise, using auto-range for measuring the current of a circuit with intermittent power draw profiles (such as MCU with sleep/active cycles) can lead to spurious MCU resets (due to ther burden voltage - the shunt resistor automatically changing) which can be hard to figure out until you realize it's the fricking meter.

Those are situations in which disabling auto-ranging is called for.

And now the conclusion is that your circuit has no inherent fault and could be useful for other people.

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