Patent ID: 11863195
Assignee: PIXART IMAGING INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 6:
7. A method of an analog-to-digital converter (ADC) device, comprising:
providing a digital-to-analog converter (DAC) circuit, the DAC circuit having an input coupled to an input voltage signal and having an output coupled to a comparator circuit;
generating a DAC voltage signal according to the input voltage signal according to a decision signal transmitted from a successive approximation register (SAR) decision circuit;
providing the comparator circuit, the comparator circuit having an input coupled to the DAC circuit, an output coupled to the SAR decision circuit, and a clock input coupled to a clock signal generated by an oscillator circuit;
generating a comparison signal into the SAR decision circuit according to the DAC voltage signal;
using the SAR decision circuit to generate the decision signal;
using the oscillator circuit to generate the clock signal according to a reset signal and a delay of the delay unit;
sequentially generating multiple bit conversion signals associated with multiple different bits of the decision signal;
generating at least one guard signal which follows the multiple bit conversion signals; and
comparing the at least one guard signal with the reset signal to adjust the delay generated by the delay unit of the oscillator circuit.