Imaging device and camera

An imaging device comprising:

• a pixel circuit configured to generate a pixel signal in accordance with a quantity of incident light;
• an amplification circuit configured to amplify the pixel signal at a gain set by selecting one from a plurality of gains which are switchable in accordance with a ratio between a value of an input capacitance and a value of a feedback capacitance;
• a control circuit configured to set the value of the input capacitance and the value of the feedback capacitance to set the gain of the amplification circuit;
• and
• an A/D conversion circuit configured to convert the pixel signal amplified by the amplification circuit into a digital signal, wherein
• the value of the input capacitance of the amplification circuit is selectable from a plurality of input capacitance values including a first input capacitance value and a second input capacitance value different from the first input capacitance value,
• the value of the feedback capacitance of the amplification circuit is selectable from a plurality of feedback capacitance values including a first feedback capacitance value and a second feedback capacitance value different from the first feedback capacitance value,
• the control circuit sets the gain of the amplification circuit to be a first gain by setting the value of the input capacitance to the first input capacitance value, and by setting the value of the feedback capacitance to the first feedback capacitance value,
• the control circuit sets the gain of the amplification circuit to be a second gain different from the first gain by setting the value of the input capacitance to the first input capacitance value, and by setting the value of the feedback capacitance to the second feedback capacitance value,
• the control circuit sets the gain of the amplification circuit to be a third gain different from the first gain and the second gain by setting the value of the input capacitance to the second input capacitance value, and by setting the value of the feedback capacitance to one of the plurality of feedback capacitance values,
• the A/D conversion circuit is of a voltage slope comparison type using a reference signal, and
• a change rate per unit-time of the reference signal of a case where the amplification circuit has a minimum gain is smaller than a change rate per unit-time of the reference signal of a case where the amplification circuit has a maximum gain.