Microwave Oscillator Based on a Single Straintronic Magnetotunneling Junction

On-chip microwave oscillators are ubiquitous in embedded communication systems found in $e.g.$ mobile phones, medically implanted devices, and defense electronics. They are usually built with operational amplifiers consisting of several transistors and other circuit elements that consume much of a chip's area, and dissipate excessive energy. This work demonstrates a fresh approach for implementing a microwave oscillator that requires only a single magnetotunneling junction and a passive resistor. Its output oscillation shows exceptional spectral purity, with nearly a single frequency component.