Lecture 33(1): Class-AB output stage; Class-AB bias using a) Monti-Celli scheme, b) pseudo resistor

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Why can't we use a diode connected NMOS in place of resistor? Reason for not using a resistor is that it can not track other transistors but if we use diode connected NMOS in place of resistor then it will give us a voltage shift and it will track other transistors.