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cascode and self regulated circuit difference

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sys_eng

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cascode.jpgself_regulated.jpg

It says the self regulated one is improved over the cascode one because it without the headroom cost.

What does it mean by headroom cost?
 

Whenever you add a cascode device, some of the voltage from supply voltage will drop across it and hence reducing overall voltage swings of the circuit and that is nothing but headroom.
 

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