| 摘要 |
The invention relates to an input amplifier stage, in AB class, having a controlled bias current and comprising a differential cell, inserted between a first supply voltage reference and a second voltage reference, having a differential pair of input transistors receiving respective differential signals and a pair of bias transistors, as well as an output-buffer circuit portion coupled to the cell by means of at least a supplementary parallel branch of transistors. This stage also comprises an additional circuit block, able to output the absolute value of an input current, inserted between a node of the differential cell of the input stage and a node of the supplementary branch in order to add the absolute value of a portion of the signal current to the differential cell bias current.
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