It is usually easy to minimize errors due to the input bias current of an opamp by adding a resistor in the input terminal, but this still leaves a small error due to the input offset current. Select one: True False

Question

Engineering

Park

3 January, 08:05

It is usually easy to minimize errors due to the input bias current of an opamp by adding a resistor in the input terminal, but this still leaves a small error due to the input offset current. Select one: True False

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Answers (2)

Know the Answer?

Hyrum · Answer 1

Answer:True

Killian Blanchard · Answer 2

True

Explanation:

Input bias current:

It is a small current that flows in parallel with the input terminals of op-amp to bias the input transistors. This current gets converted into voltage and amplified which results in incorrect output results. This bias current Ib + and Ib - flows in the positive and negative input terminals of the op-amp.

Ib + and Ib - create errors of opposite polarity. Therefore, bias current can be minimized by carefully adding a resistor in the positive input terminal.

Input offset current:

Unfortunately, a small error still remains due to the mismatch between input currents Ib + and Ib-.

This input offset current error can be adjusted by adding a potentiometer and resistor in the negative input terminal.