Analog-to-digital converter, radiation detector and wireless receiver

An analog-to-digital converter comprising:

• a digital-to-analog converter that controls a reference voltage to a predetermined value based on a control signal, and that generates a residual voltage using an analog signal and the controlled reference voltage;
• a first comparator that generates a digital comparison signal by comparing the residual voltage and a threshold voltage;
• a delay circuit that controls a delay time based on a delay control signal, and that generates a delay comparison signal obtained by delaying the digital comparison signal by the delay time;
• a detection circuit that detects a differential time signal corresponding to the delay time by using the digital comparison signal and the delay comparison signal;
• a first conversion circuit that generates a differential voltage by performing time-to-voltage conversion on the differential time signal;
• a second comparator that generates a digital delay determination signal by comparing the differential voltage and an adjustment target voltage;
• a delay control circuit that generates the delay control signal controlling the delay time in accordance with the digital delay determination signal;
• and
• a control circuit that receives a sample clock including a first state corresponding to an analog-to-digital conversion period of the analog signal, and that generates the control signal by using the delay comparison signal in the first state.