Patent ID: 8223050

Claim:
A delta-sigma A/D converter for converting a first analog input signal into a first digital signal, and converting a second analog input signal into a second digital signal, the delta-sigma A/D converter comprising: a first quantizer that quantizes a received signal and outputs a quantized signal; a first D/A converter that converts the quantized signal outputted by the first quantizer into an analog signal, and outputs the analog signal; a first operation unit that outputs a signal indicative of a difference of the first analog input signal and the analog signal outputted by the first D/A converter; a first integrator that integrates the signal outputted by the first operation unit and outputs an integrated signal; a first dither circuit that generates a first dither signal; a second operation unit that adds the first dither signal to the integrated signal outputted by the first integrator and outputs an added signal to the first quantizer; a second quantizer that quantizes a received signal and outputs a quantized signal; a second D/A converter that converts the quantized signal outputted by the second quantizer into an analog signal, and outputs the analog signal; a third operation unit that outputs a signal indicative of a difference of the second analog input signal and the analog signal outputted by the second D/A converter; a second integrator that integrates the signal outputted by the third operation unit and outputs an integrated signal; a second dither circuit that generates a second dither signal different from the first dither signal; and a fourth operation unit that adds the second dither signal to the integrated signal outputted by the second integrator and outputs an added signal to the second quantizer.