| 摘要 |
An apparatus includes: an offset adjustment unit that supplies an offset correction signal corresponding to a frequency switching to an adder unit that receives an output from a mixer; a timing adjustment unit that adjusts the timing of a frequency switching signal supplied to a local oscillator and the timing of an offset correction amount switching signal supplied to the offset adjustment unit for changing an offset amount in correspondence with the frequency switching in the local oscillator; a noise amount measurement and calculation unit that receives a signal obtained by amplifying and filtering of the signal from the adder unit, to measure a noise amount of the signal and generates a timing determination signal based on the measured noise amount; and a control unit that controls the timing of the frequency switching signal and the offset correction amount switching signal supplied to the timing adjustment unit, based on the timing determination signal from the noise amount measurement and calculation unit.
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