# Which value remain the same regardless of whether it is computed from the change in low dc supply or change in +Vcc or -Vee ?

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Which value remain the same regardless of whether it is  computed from the change in low dc supply or change in +Vcc or  -Vee ?

(a) △V

(b) △Vio

(c) △Voo

(d) None of the mentioned

I got this question in an online quiz.

The doubt is from Effect of Variation in Power Supply Voltage on Offset Voltage topic in portion Operational Amplifier Fundamentals of Linear Integrated Circuits

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Accurate answer is (d) None of the mentioned

For the easiest explanation: △V value is the same regardless of whether it is computed from the change in low dc supply or change in +Vcc or  -Vee . For example, suppose that -Vee remains constant at -10v then the +Vcc has to vary from 8 to 12v as a result of change in low dc voltage. This means that the change in △V in supply voltage +Vcc  is 2v in either direction from 10v.

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