Review on Low Voltage and High Speed Dynamic Comparator

The requirement of fast, reduced power and compact analog-to-digital converters results in the frequent application of dynamic regenerative comparators to enhance speed and efficiency of power. The comparator with positive feedback mechanism is used to convert analog signals into digital scale. The use of preamplifier in comparator circuit increases the power dissipation. Large transistors with more power and die area is needed with the purpose to counterbalance for suppression of applied voltages and to gain fast speed with accuracy. In order to cope of this problem a new dynamic comparator is proposed known as dynamic regenerative comparators whose operation is fast even in small supply voltages. This paper provides a systematic review of comparator structure their design parameter, offset voltage, kickback noise and reduction technique.