Delta sigma modulator

A ΔΣ modulator comprising:

• a first integrator which has first and second capacitors and integrates an analog input signal and a feedback analog signal;
• a second integrator which has third and fourth capacitors and integrates an output signal of the first integrator;
• a differential amplifier which has input and output terminals switched and connected via a switch circuit to either the first and second capacitors or the third and fourth capacitors;
• a quantizer which compares a signal obtained by adding the analog input signal, the output signal of the first integrator, and an output signal of the second integrator and a reference signal to output a digital value;
• and
• a digital/analog converter which outputs the feedback analog signal according to the digital value provided from the quantizer,
• the differential amplifier including a chopper amplifier which switches a polarity of the input terminal and a polarity of the output terminal, said input and output terminals being connected with either the first and second capacitors or the third and fourth capacitors.