Quantification and conversion method, control circuit, analog-to-digital converter and cardiac pacemaker

The invention discloses a quantization and conversion method for a low-activity signal, a control circuit, an analog-to-digital converter and a cardiac pacemaker. The quantization method comprises thesteps of comparing sampling signals to obtain the value of the MSB bit of the highest bit, determining a preset quantization value and the DIR of the low bit, sequentially modifying the preset quantization value from the low bit to the high bit according to the value of the DIR, and gradually performing quantizing from the high bit to the low bit when the output result of the comparator is overturned. In the analog-to-digital converter, the sampling holding circuit fixes the gate-source voltage of the sampling switch in a predetermined range of a power supply VDD through a capacitor and an inverter structure. The dynamic latch comparator comprises an output offset calibration structure. The output offset calibration structure comprises a pre-comparator and a latch, the CDAC capacitor array is a common-mode consta