The GATE Grind

GATE 2023 IN – Question 26

Analog Electronics · Operational amplifiers and applications · 1 mark · Numerical answer

The opamp shown is ideal except for input bias current 1 nA and input offset voltage 10 μV. The worst-case output voltage is ±______ μV (nearest integer).

Diagram for GATE 2023 IN question 26

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: 1110 to 1110

Explanation

The offset noise gain is $1+100\mathrm{k}/1\mathrm{k}=101$, contributing $101(10)=1010$ μV. Input-bias contribution is $I_bR_f=(1\ \mathrm{nA})(100\ \mathrm{k}\Omega)=100$ μV. Worst-case polarities add to **1110 μV**.