Patent ID: 7675315

Claim:
A low output impedance output stage providing an output signal on an output terminal, said output stage comprising: an amplifier comprising an input terminal, and generating an output from an input signal; a first transistor comprising a gate terminal coupled to receive said output, a second transistor coupled in cascade with the first transistor having a drain terminal coupled to said output terminal, wherein each of said first and second transistors comprises a P-channel metal oxide semiconductor field effect transistor and a source terminal and a bulk terminal of said second transistor are at least at substantially at a same potential, wherein said drain terminal of said second transistor is connected to said first transistor to provide a first feedback path, said output terminal of said output stage being coupled to said input terminal of said amplifier to provide another feedback path independent of the first feedback path and having a capacitor provided between said output terminal of said output stage and a gate terminal of said second transistor; and one or more biasing components comprising a first current source and a second current source respectively providing the corresponding operating point for said first transistor and said second transistor.