Question

For designing a non-inverting amplifier with a gain of 2 at the maximum output voltage of 10 V and the current in the voltage divider is to be 10 μA the resistance required are R1  and R2  where R2 is used to provide negative feedback. Then

(a) R1  = 0.5 MΩ and R2 = 0.5 MΩ

(b) R1  = 0.5 kΩ and R2 = 0.5 kΩ

(c) R1  = 5 MΩ and R2 = 5 MΩ

(d) R1  = 5 kΩ and R2 = 5 kΩ

This question was addressed to me in exam.

Enquiry is from The Non Inverting Configuration topic in division Operational Amplifiers of Electronic Devices & Circuits

Answer 1

The correct choice is (a) R1  = 0.5 MΩ and R2 = 0.5 MΩ

Best explanation: 1 + R2/R1  = 2 and 10/(R1+R2) = 10 μA. Solve for R1  and R2.