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I want to find a circuit that can replace the ideal current source in the two stage amp,my classmate said that i can use the bandgap to replace it,but i want to make sure of it,doesn't bandgap provide a stable voltage?why can it be a current source?so can anyone give me a suggestion?

I also find a circuit from here:

Replacing Ideal current source in two-stage opamp

but honestly,i don't know how to calculate it,so i can't use it to replace the ideal current source

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