| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC offset canceler capable of canceling a DC offset by reducing an influence of noise. SOLUTION: The DC offset canceler includes a first DA converter for DA-converting first correction data into a first correction voltage and outputting a first correction voltage, a first adder for adding an input signal and the first correction voltage to output a first added signal, an amplifier for amplifying the output signal of the first adder and outputting an amplified signal, a comparator for comparing the output signal of the amplifier with a reference voltage to output a comparison result, an averaging circuit for receiving the comparison result of the comparator to obtain a majority decision result by performing majority decision on logical values of the comparison results in a predetermined time period, and a successive approximation register (SAR) for sequentially setting each bit of the first correction data based on the majority decision result so that the DC offset in the output signal of the amplifier decreases. COPYRIGHT: (C)2011,JPO&INPIT
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