Patent ID: 8680924

Claim:
A differential power amplifier comprising: a first push-pull pair of transistors comprising a first transistor inductively coupled to a voltage source and connected to a node, wherein the node is at a ground reference potential, a second transistor (i) inductively coupled to the node at the ground reference potential, and (ii) connected to the voltage source, wherein a gate of the first transistor and a gate of the second transistor are configured to receive an alternating current (AC) signal, the alternating current (AC) has a fundamental frequency, a drain of the first transistor is a first output node, and a drain of the second transistor is a second output node the first output node and the second output node provide a first differential output; a first capacitor connected between the first output node and the second output node, wherein the first capacitor provides a pathway for cancellation of even harmonic signals of the fundamental frequency of the alternating current (AC) signal; a second push-pull pair of transistors providing a second differential output; a first inductor connected between the first output node and the second output node; a second inductor connected between output nodes of the second push-pull pair of transistors; and a combiner inductively coupled to the first inductor and the second inductor.