Patent ID: 7151410

Claim:
A class AB enhanced transconductance source following circuit, comprising: a NMOS source follower device having an output load; a PMOS first current supply device having an operating current; a PMOS folded cascode device having a source contact connected to a drain contact of said NMOS source follower such that the source current of said NMOS source follower is sensed by said PMOS folded cascode device directly and steered towards said output load; a NMOS first common source device, capable of multiplying said sensed current and feeding said multiplied current to the output load; and a PMOS second common source device, capable of sensing an over limit current condition when the current at the drain of said NMOS source follower device exceeds said operating current of said PMOS first current supply device and, on sensing said over current limit being capable of acting as a PMOS second current supply device, supplying current to said output load.