Solid-state imaging device having a plurality of AD conversion circuits

A solid-state imaging device comprising:

• a plurality of pixels arrayed in a matrix;
• and
• a plurality of AD conversion circuits provided for every column of the plurality of pixels and which converts analog signals from the plurality of pixels into digital signals,
• wherein each of the plurality of AD conversion circuits includes:
• a ring delay circuit which has a plurality of delay units that outputs a pulse signal input to a pulse input terminal from a pulse output terminal after delaying the pulse signal by a delay time corresponding to the analog signal, in which the pulse output terminal of each of the plurality of delay units is connected to the pulse input terminal of the next-stage delay unit, and in which the plurality of delay units is connected to each other in a ring shape so that the pulse signal circulates through the plurality of delay units;
• a plurality of first switches each of which is connected between the pulse output terminal of each delay unit and the pulse input terminal of the next-stage delay unit;
• a plurality of second switches each of which is connected between the pulse output terminal and the pulse input terminal of each of the delay units;
• and
• a control circuit which turns on the plurality of first switches and turns off the plurality of second switches in conjunction with an oscillation operation and which turns off the plurality of first switches and turns on the plurality of second switches in relation with a holding operation.