An analog-to-digital converter is a device that converts a continuous physical quantity to a digital number that represents the quantity’s amplitude. The conversion involves quantization of the input, so it necessarily introduces a small amount of error. Complementary metal–oxide–semiconductor (CMOS) is a technology for constructing integrated circuits. CMOS technology is used in microprocessors, microcontrollers, static RAM, and other digital logic circuits. CMOS technology is also used for several analog circuits such as image sensors (CMOS sensor), data converters, and highly integrated transceivers for many types of communication. An ADC may also provide an isolated measurement such as an electronic device that converts an input analog voltage or current to a digital number proportional to the magnitude of the voltage or current. Instead of doing a single conversion, an ADC often performs the conversions. Some radar systems commonly use analog-to-digital converters to convert signal strength to digital values for subsequent signal processing. Many other in situ and remote sensing systems commonly use analogous technology. The proposed method is to optimize the ADC circuit complexity level.