Various architectures of analog to digital converter

With the change in advanced technology and the need for electronic equipments, the development of electronic instruments stimulate more efforts for more innovative ideas and better performance of design. In real world physical values, such as pressure, humidity, temperature and voice can be measured as analog (continuous) signals. However, to process these analog signals by electronic digital equipments, we need to convert these analog signals into digital or discreet signals or binary. In this paper, there are many types of Analog-to-Digital Converters (ADCs) which can be classified according to the applications and concept on which they were designed. ADCs including, Direct conversion ADC (Flash), successive approximation ADC, integrating ADC, Pipeline ADC. In some cases, many comparators are used to reduce the complexity, power and improve the linearity which are also explained in this paper.