Patent ID: 7592867
Filing Date: 2009-09-22
Classification: H03F

Abstract:
1. A differential amplifier comprising: a differential input transistor pair including first and second input transistors each having a first electrode, a second electrode, and a control electrode; a first folded cascode stage including first, second, third and fourth current source transistors and first and second cascode transistors each having a first electrode, a second electrode, and a control electrode, first and second summing junctions coupled to the second electrodes of the first and second input transistors, respectively, and first and second outputs conducting first and second output signals, respectively, the second electrodes of the first and second current source transistors being coupled by the first and second summing junctions, respectively, to the first electrodes of the first and second cascode transistors, the second electrodes of the first and second cascode transistors being coupled to the first and second outputs, respectively, and the second electrodes of the third and fourth current source transistors being coupled to the first and second outputs, respectively; and common mode feedback circuitry including: