The progress of the double-tail dynamic comparators and an improvement design

Analog-to-digital converter (ADC) is a converter that converts continuous signals in analog domain into discrete signals in digital domain, which plays an indispensable role in the development of integrated circuits. The comparator is the most important component in the ADC. The paper mainly analyses the development of high-speed, low-power, low-noise dynamic comparators and introduces an innovative comparator subsequently. Based on the demonstration of the traditional two-stage double-tail comparator, the regeneration speed of the latch stage is increased by adding two control transistors, i.e., achieves low power consumption and low delay. By transforming latch-level transistors into separated gate-biasing cross-coupled transistors, the transistors are biased in the strong inversion region, achieving the advantage of realizing high-speed comparison. In addition, this article also introduces two technologies for replacing transistors with tail capacitors, and an innovative edge-pursuit comparator (EPC) technology. These results shed light for the performance can be enhanced by adding transistors and replacing tail transistors with tail capacitors. It can also reduce delay and power consumption through innovative loop structure.