Folded-cascode amplifier with efficient feedforward gain-boosting

An efficient implementation of a two-stage feedforward amplifier is proposed. The new amplifier topology boosts the DC gain of a folded-cascode amplifier by adding a gain path, which makes use of the `free` transconductance of the folding current sources. Only a single differential pair is used to convert the input voltage to a current. A current splitter extracts the parts needed for feedforward and for the first gain stage. This turns out to be favourable in terms of noise when compared with more traditional feedforward amplifiers.