Ad conversion circuit, photoelectric conversion device, image capturing device, moving body, and method of driving ad conversion circuit

A method of driving an AD conversion circuit configured to convert an analog signal provided to an input terminal into a digital signal,

• the AD conversion circuit comprising:
• a ΔΣ AD converter including an integration circuit configured to integrate a difference signal;
• a holding circuit;
• and a switching circuit configured to switch between connection between the input terminal and the ΔΣ AD converter and connection between the holding circuit and the ΔΣ AD converter,
• the method comprising:
• causing the switching circuit to connect between the input terminal and the ΔΣ AD converter to supply an analog signal supplied to the input terminal to the ΔΣ AD converter and causing the holding circuit to hold a voltage signal corresponding to a voltage output from the integration circuit;
• and
• causing the switching circuit to connect between the holding circuit and the ΔΣ AD converter to supply a voltage signal held by the holding circuit at an end of the causing the switching circuit between the input terminal and the ΔΣ AD converter to the ΔΣ AD converter after the causing the switching circuit between the input terminal and the ΔΣ AD converter,
• wherein the integration circuit includes a continuous-time integrator and a discrete-time integrator connected to an output of the continuous-time integrator.