A Review of Comparators Inprovment Design

Abstract

This paper reviews and analyzes the three proposed new comparators, as a indirection of future works. The first improved design is the pre-amplifier improved comparator that the input of the latch is changed to a PMOS transistor, and a pair of cross-coupled transistors are used in the preamplifier part to amplify the gain, which finally realizes the proposed circuit with better comparison speed, more less power dissipation. The switch separated latch comparator is another improved design that the latching stage with separate gate-biased cross-coupled transistors. Using this new transconductance-enhanced latching stage enables dramatic reductions in delay and power dissipation. The third type of comparator proposed is an innovative design. It adds a capacitor to the input tail current source of the preamplifier. Compared with the original Elzakker comparator, power dissipation has dropped by almost 50%.