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If the reference and collector current are 0.539mA and 0.49mA respectively, how many transistors are used in current repeater circuit? (Assume β =150)

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in Linear Integrated Circuits by (39.8k points)
If the reference and collector current are 0.539mA and 0.49mA respectively, how many transistors are used in current repeater circuit? (Assume β =150)

(a) 11

(b) 14

(c) 10

(d) 8

I have been asked this question in an online interview.

This interesting question is from Operational Amplifier Internal Circuit in division Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Right choice is (b) 14

Discover the easiest explanation: The current equation is given as  IC= Iref×β/(β+1+N)

⇒ 0.49mA= 0.539mA×150/(150+1+N)

⇒ N=14.

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