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

Claim 0:
1. An analog-to-digital converter (ADC) device, comprising:
a digital-to-analog converter (DAC) circuit, having an input coupled to an input voltage signal and having an output coupled to a comparator circuit, for 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;
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, for generating a comparison signal into the SAR decision circuit according to the DAC voltage signal;
the SAR decision circuit, for generating the decision signal;
the oscillator circuit having a delay unit, coupled to the comparator circuit, for generating the clock signal according to a reset signal and a delay of the delay unit; and
a processing circuit, coupled to the oscillator circuit and the SAR decision circuit, for sequentially generating multiple bit conversion signals associated with multiple different bits of the decision signal, for generating at least one guard signal which follows the multiple bit conversion signals, and then for comparing the at least one guard signal with the reset signal to adjust the delay generated by the delay unit of the oscillator circuit.