Analog-to-digital converter, method of analog-to-digital conversion, and electronic apparatus

A method of analog-to-digital conversion, the method comprising:

• outputting a first voltage by sampling an analog signal;
• outputting a second voltage by converting a digital signal;
• amplifying the first voltage and the second voltage;
• comparing a sum of the amplified first voltage, a first integration voltage, and a second integration voltage with the amplified second voltage;
• outputting the digital signal according to a comparison result;
• and
• generating the first integration voltage and the second integration voltage by integrating a residual voltage corresponding to a difference between the amplified first voltage and the amplified second voltage.

An electronic apparatus, comprising:

• a display device, which displays an image;
• and
• a sensor, which senses an external input to the display device, and includes an analog-to-digital converter,
• wherein the analog-to-digital converter includes:
• a sample/hold circuit, which samples an analog signal generated by the external input, and outputs a first voltage;
• a digital-to-analog conversion circuit, which converts a digital signal to output a second voltage;
• an amplifier, which amplifies the first voltage and the second voltage;
• a noise shaping filter, which integrates a residual voltage corresponding to a difference between the amplified first voltage and the amplified second voltage, and generates a first integration voltage and a second integration voltage;
• a comparator, which compares a sum of the amplified first voltage, the first integration voltage, and the second integration voltage with the amplified second voltage;
• and
• a SAR logic, which outputs the digital signal according to a comparison result of the comparator, and controls the digital-to-analog conversion circuit.