1. An amplifier comprising: (a) a translinear transconductance stage including a first pair of input transistors coupled to receive an input signal of the amplifier and operable to produce a first current having a square-law relationship to the input signal; and (b) a differential stage including a second pair of input transistors coupled to receive the input signal and a tail current source coupled to the translinear transconductance stage and operative to produce a square-law tail current in response to and proportional to the first current.