This bulletin reflects the analysis power gained through knowledge of an op amp circuit's feedback factor. Feedback dictates the performance of an op amp both in function and in quality. The major specifications of the amplifier descibe an open-loop device awaiting feedback direction of the end circuit's function. Just how well the amplifier performs the function reflects through the feedback interaction with the open-loop error specifications. Most open-loop errors simply reflect to the circuit output amplified by the reciprocal of the circuit's feedback factor.