| 摘要 |
<p>An approach capable of significantly reducing the offset or drift of a DC amplifier as compared with the level of commercially available IC amplifiers. For the offsets and drifts existing at random in individual amplifiers, an approach is taken in which a plurality of amplifier circuits are electrically combined, and the outputs of the amplifier circuits, which amplify the same input at the same time, are weighted to perform an averaging process, thereby achieving an amplification substantially free from offsets. On the other hand, for the offsets and drifts having tendencies common to the same type of amplifiers, a pair of the same type of amplifiers is used to constitute an inverting amplifier circuit and a non-inverting amplifier circuit, and the outputs of these two circuits are weighted and then inputted to the respective input terminals of a differential amplifier circuit, thereby performing a signal amplification. In this way, the signal voltages are added, while the offset voltages of the non-inverting and inverting circuits can be cancelled into substantially zero.</p> |
