Patent ID: 8554162
Filing Date: 2013-10-08
Classification: H03F,H03H

Abstract:
1. A power amplifier circuit comprising: a current generator configured to generate a radio frequency differential injection current at differential current generator outputs based on an input signal; a pair of cross-coupled switching transistors, each including a source node, a gate node, and a drain node, said pair of switching transistors cross-coupled such that the drain node of each one of the switching transistors couples to the gate node of the other switching transistor, wherein the drain nodes are coupled to the differential current generator outputs; a pair of cross-coupled cascode transistors, each including a source node, a gate node, and a drain node, said pair of cascode transistors cross-coupled such that the drain node of each one of the cascode transistors couples to the gate node of the other cascode transistor via a corresponding one of first and second tap capacitors, wherein the source nodes of the cascode transistors couple to corresponding ones of the drain nodes of the switching transistors and to the differential current generator outputs, and wherein said pair of cross-coupled cascode transistors is configured to generate a differential amplified output signal at the drain nodes of the cascode transistors based on a supply voltage operatively coupled to the drain node of the cascode transistors and the differential injection current.