Latest demand for advanced IC solutions in industrial, wireless or biomedical field, has lead to a growing interest for innovation in data converters. Physical signals, such as audio, radio or image signals, belonging to the real world, have to be converted into numerical values, with the intention of process and store them. Analog-to-Digital converters represent the interface between the analog domain and the digital domain. In modern applications regarding the biomedical field, energy and area consumption have become critical requirements for an ADC. Converters adopted for acquire bio-signals, such as ECG, must have low power consumption and low area, in order to allow the highest level of integration, as well as long battery life in case of portable devices.