Fabrication and Optimization of a Four-Bit Absolute Comparator

With the development of artificial intelligence, AI large models are becoming more and more popular. This is followed by an increasing demand for graphics card computing power. There are many areas in the graphics card, such as image and video processing, 3D rendering. These areas need to process a large amount of data, in order to reduce the computing power consumed by the graphics card. People can use the comparator for edge detection and threshold processing or noise removal, filtering waveform and so on. The purpose of this paper is to make a four-bit absolute comparator. In this paper, a four-bit absolute value comparator is made by circuit principle and truth table and the circuit is simplified by formula simplification method to make the logic circuit more concise. And through MATLAB simulation test, we successfully realized the function. Finally, through the critical path, changing the size of the logic gates and Vdd input increases the delay to some extent but corresponds to a significant reduction in energy loss. After optimization, the energy loss is reduced by 48.13% to 38.40 J at 1.5 times delay.