| 摘要 |
A first differential pair and a second differential pair each receive differential input signals. The first differential pair and the second differential pair are connected such that the second differential pair receives part of a tail current of the first differential pair, and such that output signals of the first differential pair and output signals of the second differential pair cancel each other. A constant current source supplies the tail current to the first differential pair. A transistor which functions as a variable current source is connected between a current path and the second differential pair, and supplies a current drawn from the current path to the second differential pair, the current path connecting the first differential pair and the constant current source.
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