Clock detection method, clock detection circuit, and image sensor

A clock detection circuit, wherein it comprises a first AND gate, a first switch element, a second switch element, a first capacitor, a second capacitor, a comparator, and a flip-flop;

• a first input end of the first AND gate is configured to receive an enable signal, a second input end of the first AND gate is configured to receive a first clock signal, and an output end of the first AND gate is connected to a control end of the first switch element;
• a first end of the first capacitor is connected to a first end of the first switch element, a second end of the first capacitor is grounded, and the second capacitor is connected between a second end of the first switch element and ground, and a third end of the first switch element grounded;
• a first end of the second switch element is connected to a first preset voltage, and a second end of the second switch element is connected to the second end of the first switch element;
• a positive input end of the comparator is connected to the second end of the second switch element, a negative input end of the comparator is connected to a second preset voltage, and an output end of the comparator is connected to an input end of the flip-flop;
• a trigger end of the flip-flop is connected to the second input end of the first AND gate, a reset end of the flip-flop is connected to the first input end of the first AND gate, and an output end of the flip-flop outputs a clock detection result signal.