| 摘要 |
A delta-sigma modulator and A/D converter is capable of doubling an oversampling ratio without increasing the operating speed of the circuit at an A/D modulator provided with a delta-sigma modulator which carries out differentiation and integration processing on two channels of analog input. Delta-sigma modulator 100 is configured with first sampling section 110 that samples first analog input, second sampling section 120 that samples second analog input, third sampling section 130 that samples output of quantizer 180 corresponding to the first analog input, fourth sampling section 140 that samples output of quantizer 180 corresponding to the second analog input, and switch control circuit 200 that controls analog switches so as to carry out time division processing on integration of the output of first sampling section 110 and the output of third sampling section 130 and integration of the output of second sampling section 120 and the output of fourth sampling section 140.
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