Apparatus and method for converting analog signal into digital signal taking average value of analog signal for sample period

An apparatus for converting an analog signal into a digital signal, the apparatus comprising:

• a signal input unit to which an analog signal is input;
• a reference signal input unit to input any one of a first reference signal and a second reference signal;
• a sampling unit performing a sampling operation by taking an average value of the analog signal during a predetermined sample period as a sample value;
• a signal conversion unit converting the analog signal into a digital signal using the sample value;
• a controller to control the reference signal input and output the digital signal in response to the signal conversion unit;
• and
• a clock generation unit to input an operational clock to operate the unit, the signal conversion unit, and the controller.

A method of converting an analog signal into a digital signal, the method comprising:

• inputting an analog signal;
• performing a sampling operation by taking an average value of the analog signal for a predetermined sample period as a sample value, the performing the sampling operation including integrating the analog signal during the predetermined sample period and sampling/holding an integral value obtained after the analog signal is integrated;
• and
• converting the analog signal into a digital signal using the sample value.