| 摘要 |
An error calculation circuit used for compensating a carrier leak at an output signal of a mixer has a sign extraction unit for extracting the sign of a baseband signal which is applied to the mixer, an envelope detecting unit for performing envelope detection on the output signal of the mixer, and a signal processing unit for generating an error compensation signal to compensate the carrier leak based on the result of the sign extraction and envelope detection. The signal processing unit preferably calculates the compensation signal by using multiplication of the sign of the baseband signal by an amplitude of the envelope.
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