Modulator

A modulator comprising:

• an integrator including
• a differential amplifier,
• a first switch connected between an input terminal and an output terminal of the differential amplifier, and
• a series circuit having a second switch, an input capacitance chopping switch for chopping capacitance, an integration capacitor, and an output capacitance chopping switch for chopping capacitance, the series circuit being connected between the input terminal and the output terminal of the differential amplifier;
• an input chopping switch connected to an input side of the integrator;
• an output chopping switch connected to an output side of the integrator;
• and
• a control circuit configured to control the input chopping switch and the output chopping switch to execute chopping at a chopping frequency identical to the input capacitance chopping switch and the output capacitance chopping switch, wherein
• the chopping frequency of the input capacitance chopping switch and the output capacitance chopping switch is set to be lower than a switching frequency of the first switch, and
• the control circuit is further configured to set a potential of a common connection node of the second switch and the input capacitance chopping switch to an initial potential by turning on the first switch and the second switch in a transition period during which each of the input capacitance chopping switch and the output capacitance chopping switch is turned on or off.