This　article　analyzes　and　compares　four　different　types　of　comparators.　Strong　Arm　latch　(SA　latch)　mainly　have　an　excellent　presentation　in　offset　calibration.　However,　when　increasing　capacitor　to　minimize　the　noise,　delay　will　rise　in　SA　latch.　The　problems　that　SA　latch　needs　a　large　headroom,　and　it　is　heavily　affected　by　the　kickback　noise　are　solved　by　Dynamic　Bias　comparator.　The　comparator　with　Floating　Inverting　Amplifier　(FIA)　is　based　on　the　Dynamic　Bias　one,　which　means　it　has　better　performance,　while　it　consumes　larger　chip　area.　This　structure　not　only　solves　the　dependence　on　input　common-mode　voltage　of　comparator,　but　also　further　reduce　energy　consumption　compared　with　Dynamic　Bias　comparator.　In　addition　to　these　three　traditional　comparators,　EPC　can　greatly　reduce　the　energy　consumption　of　the　comparator　in　crude　comparison,　thus　improving　energy　efficiency.　©　VDE　VERLAG　GMBH　∙　Berlin　∙　Offenbach.