| 摘要 |
PROBLEM TO BE SOLVED: To obtain a signal processing circuit and a signal processing method which are capable of reducing a distortion due to temperature when inputting a signal to a mixer to convert the signal into a desired frequency. SOLUTION: When a detection result of a temperature sensor 133 is lower than a prescribed temperature, an attenuation factor of a first variable attenuator 102 is large, and that of a second variable attenuator 108 is small, When the detection result is within a range of the prescribed temperature or higher, the relation of attenuation factors is inverted. In a mixer 104 which has the gain increased to increase the distortion at a low temperature, the increase in distortion of IM 3 can be prevented by increasing the attenuation factor at a low temperature. When a mixer which has an amplifier of which the amplification factor rises at a low temperature, in a preceding stage thereof is used, the increase in distortion can be prevented in the same manner. The amplification factor may be adjusted instead of the attenuation factor. COPYRIGHT: (C)2008,JPO&INPIT
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