In a follower configuration, the offset voltage of the LF441 op-amp need not be trimmed because it is what?

In a follower configuration, the offset voltage of the LF441 op-amp need not be trimmed because it is what?

• A. low in value
• B. high in value
• C. canceled by feedback
• D. not present

Answer: (A)

In a unity-gain follower, the output is fed back to the inverting input so the loop drives the input difference to nearly zero. The offset voltage is the small differential voltage that the amplifier needs between its inputs to produce zero output when unconstrained. With a follower, the closed-loop gain is 1, so the output ends up shifted by roughly the same amount as the input offset. If this offset value is small, the resulting output error is tiny, and there’s little need to trim it. The LF441 is designed with a very small input offset voltage, so in this configuration the offset error is negligible, making trimming unnecessary.

In a unity-gain follower, the output is fed back to the inverting input so the loop drives the input difference to nearly zero. The offset voltage is the small differential voltage that the amplifier needs between its inputs to produce zero output when unconstrained. With a follower, the closed-loop gain is 1, so the output ends up shifted by roughly the same amount as the input offset. If this offset value is small, the resulting output error is tiny, and there’s little need to trim it. The LF441 is designed with a very small input offset voltage, so in this configuration the offset error is negligible, making trimming unnecessary.