What is a common Base amplifier?

Common base amplifier is on in which the base terminal is common to both input and output circuit. Following are the some of the characteristic parameters of CB amplifier neglecting the output resistance of amplifier (which accounts for early effect) are

Rin = re

Av = gm*(Rc//Rl)

Rout = Rc

Gv = α*(Rc//Rl)/(Rsig+re)

Ais = α.