Patent ID: 7847714

Claim:
A ΔΣ-type A/D converter comprising: a first channel for converting a first analog input signal into a digital signal; and a second channel for converting a second analog input signal into a digital signal, the first channel including: a first quantizer for quantizing a first signal; a first dither circuit for generating a first DC addition voltage which is superimposed on a first difference signal which is a difference between a signal on a signal line for propagating the first analog input signal and a first feedback signal obtained by converting an output signal of the first quantizer into an analog signal; and a first integrating circuit for integrating the first difference signal having the first DC addition voltage superimposed thereon and outputting a resulting signal as the first signal, the second channel including: a second quantizer for quantizing a second signal; a second dither circuit for generating a second DC addition voltage which is different from the first DC addition voltage and is superimposed on a second difference signal which is a difference between a signal on a signal line for propagating the second analog input signal and a second feedback signal obtained by converting an output signal of the second quantizer into an analog signal; and a second integrating circuit for integrating the second difference signal having the second DC addition voltage superimposed thereon and outputting a resulting signal as the second signal.