Patent ID: 11876526
Assignee: REALTEK SEMICONDUCTOR CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The ADC apparatus of claim 1, wherein each of the ADC circuits comprises:
a capacitor switching circuit;
a digital-to-analog conversion (DAC) capacitor array comprising a plurality of higher-bit capacitors and a plurality of lower-bit capacitors, configured to receive a first reference voltage from a first input terminal through the capacitor switching circuit and receive the input analog signal from a second input terminal, to generate an output voltage at an output terminal;
a comparing circuit configured to compare the output voltage and a second reference voltage to generate a comparison result; and
a control circuit configured to control the capacitor switching circuit with a group of higher-bit digital codes and a group of lower-bit digital codes, so as to control the capacitor switching circuit to generate a higher-bit connection combination corresponding to the higher-bit capacitors according to the previous higher-bit conversion result and further control the capacitor switching circuit to generate a lower-bit connection combination corresponding to the lower-bit capacitors according to the comparison result based on the successive-approximation mechanism,
wherein when the output voltage approximates the second reference voltage, the group of higher-bit digital codes and the group of lower-bit digital codes that the higher-bit connection combination and the lower-bit connection combination respectively correspond to approximate the input analog signal, such that the group of higher-bit digital codes serve as the current higher-bit conversion result, the group of lower-bit digital codes serve as the current lower-bit conversion result and the remained signal amount of the output voltage serves as the residue.