| 摘要 |
A semiconductor integrated circuit device comprising a linearizer that has a plurality of switchable first gain characteristics, the linearizer switching to the first gain characteristic to generate an intermediate signal from an input signal by using the switched first gain characteristic, and outputting the intermediate signal to a circuit having a second gain characteristic, wherein the linearizer includes: a linearization unit that has at least one of first rectifier, and linearizes the input signal; and a linearization reducing unit that has a plurality of second rectifiers having polarity opposite to polarity of the first rectifier and a first switching unit selecting at least one of the second rectifiers based on a control signal, the linearization reducing unit being connected in parallel to the linearization unit and reducing linearization of the input signal by the linearization unit.
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