Patent ID: 7463078

Claim:
A PFET level shifting differential amplifier comprising: a first power supply; a second power supply; a pair of differential inputs; a first PFET having a first gate in electrical communication with a first one of said pair of differential inputs, a first terminal in electrical communication with said first power supply, and a second terminal; a second PFET in parallel with said first PFET, said second PFET having a second gate in electrical communication with a second one of said pair of differential inputs, a third terminal in electrical communication with said first power supply, and a fourth terminal; a first adjustable impedance element electrically connected between said second terminal and said second power supply; a second adjustable impedance element in parallel with said first adjustable impedance element, said second adjustable impedance element being electrically connected between said fourth terminal and said second power supply wherein said first and second impedance elements each include a pass gate including a PFET with a third gate in electrical communication with said second power supply and an NFET with a fourth gate in electrical communication with said first power supply; a first output node electrically connected between said second terminal and said first adjustable impedance element; a second output node electrically connected between said fourth terminal and said second adjustable impedance element; and a third adjustable impedance element electrically connected between said first and second output nodes, said third adjustable impedance element includes a first diode connected FET or a pass gate.