Question

Where does the compensating network connected in an inverting amplifier.

(a) Non-inverting input terminal

(b) Inverting input terminal

(c) Between non-inverting and output terminal

(d) Between inverting and output terminal

The question was posed to me in an interview for job.

I need to ask this question from Input Offset Voltage in section Operational Amplifier Fundamentals of Linear Integrated Circuits

Answer 1

In an inverting amplifier, the compensating network to address input offset voltage is typically connected at the non-inverting input terminal.

Correct answer:

(a) Non-inverting input terminal

Explanation:

• The input offset voltage (VioV_{io}Vio​) is usually present due to mismatches in the internal transistors of the operational amplifier.
• In an inverting amplifier, the compensating network (typically a resistor or potentiometer) is added at the non-inverting input to nullify the effects of the input offset voltage, ensuring the output remains unaffected by these internal imbalances.
• This network helps balance the input bias currents and the offset voltage, improving the accuracy of the amplifier’s output.