Before revision: Input offset voltage A voltage across the op amp's input terminals may be required to drive the output voltage to zero.This definition hews to the convention of measuring op-amp parameters with respect to the zero voltage point in the circuit, which is usually half the total voltage between the amplifier's positive and negative power rails.
After revision: Input offset voltage Input offset voltage is a voltage required across the op amp's input terminals to drive the output voltage to zero.This definition hews to the convention of measuring op-amp parameters with respect to the zero voltage point in the circuit, which is usually half the total voltage between the amplifier's positive and negative power rails.