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Current mirror type of start-up circuit

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PaloAlto

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In circuit sage's document about bandgaps, (see https://www.edaboard.com/viewtopic.php?p=523181#523181 ), it mentions that there is some current mirror type of start-up. I know I have seen that type of circuit before and I believe that it doesn't use any comparator or inverter to do the start-up operation, but I don't remember how it is.

Does anyone know how this circuit is? Can anyone post a reference and/or drawing, please?

Thanks
 

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