Patent ID: 7642858

Claim:
An active balun, comprising: a resonator that converts a single-ended input signal to at least two differential input signals; and a differential switching block that includes first and second transistors that each receive a respective one of the at least two differential input signals from the resonator, wherein the first and second transistors are cross-coupled to each other to provide a first differential output signal and a second differential output signal, wherein the resonator includes: a first resonant component having a first end and a second end, wherein a first end is connected to the first transistor and the second end is connected to the second transistor, wherein an input port for the single-ended input signal is provided at the first end or the second end, a second resonant component connected between the first end of the first resonant circuit and ground, and a third resonant component connected between the second end of the first resonant component and ground.