A Survey on the Design of Current Comparator

In recent decades, the application demand of current comparator has increased rapidly, which makes the structure of current comparator mature and becomes an important part of many circuits. Current comparator will replace voltage comparator because of its excellent performance. This paper summarizes the recently proposed comparator circuit structures and shows the main parameters which have an impressive influence on the performance of the comparator. A variety of types of current comparator are described, including the traditional current comparator, the compensated current comparator, the current comparator based on CCII (Second Generation Current Conveyor), switched current comparator, current comparator based on reduced structure, etc. This paper could provide guidance for the development of high performance current comparators.