Delta-sigma modulator

A delta-sigma modulator comprising:

• a first integral unit configured to integrate an input analog signal;
• a second integral unit configured to integrate a signal output by the first integral unit;
• a quantizer configured to quantize a signal output by the second integral unit;
• a digital-to-analog (DA) converter configured to perform DA conversion on an output of the quantizer and output a feedback signal to be fed back to the first integral unit;
• and
• a control unit configured to perform control to cause the first integral unit and the second integral unit to perform different integral operations during a first period and a second period, wherein
• the second integral unit is configured to receive the feedback signal output by the DA converter via the first integral unit and integrate the feedback signal during the first period and the second period, and
• the control unit is configured to control the first integral unit to be caused to operate as an integrator in which a feedback coefficient during the second period is lower than a feedback coefficient during the first period.

A delta-sigma modulator comprising:

• a first integral unit configured to integrate an input analog signal;
• a multiplexer configured to select and output a signal output by the first integral unit and the input analog signal;
• a second integral unit configured to integrate a signal output by the multiplexer;
• a quantizer configured to quantize a signal output by the second integral unit;
• a digital-to-analog (DA) converter configured to perform DA conversion on an output of the quantizer and output a feedback signal to be fed back to the first integral unit;
• and
• a control unit configured to perform control to cause the first integral unit and the second integral unit to perform different integral operations during a first period and a second period, wherein
• the control unit is configured to control the second integral unit to be caused to operate as an integrator in which a feedback coefficient during the second period is higher than a feedback coefficient during the first period, and
• the control unit is configured to control the multiplexer to output, to the second integral unit, a signal output by the first integral unit during the first period, and to control the multiplexer to output, to the second integral unit, the analog signal input to the first integral unit during the second period.