Successive approximation analog-to-digital converter with segmented reference voltage

The invention discloses a successive approximation analog-to-digital converter with segmented reference voltage. The successive approximation analog-to-digital converter comprises a voltage input end, a comparison module and a capacitance trimming control circuit, the voltage input end inputs a comparison voltage value and a reference voltage value into the comparison module, the comparison module outputs an obtained comparison result to the capacitance trimming control circuit, and the capacitance trimming control circuit adjusts the comparison voltage value and inputs the comparison voltage value into the comparison module again through the voltage input end; repeating the operation to enable the comparison voltage value to gradually approach the reference voltage value; therefore, the stability of the input voltage in the quantization stage is ensured. According to the successive approximation analog-to-digital converter with the segmented reference voltage, the input voltage is adjusted through the arrang