Inside the core there are three important models, such as digital-to-analog converter (DAC), voltage comparator and some other digital logic units.

To stress the application of Karaugh map on designing of coding circuits in parallel-comparator ADC in terms of the design of combinational logic circuits.

Through adding a zero-crossing comparator and optimizing the inverter switching logic, this method which is based on the traditional two-state hysteresis control can achieve three-state outputs.