US 9,819,308 B1Granted

System and method for reducing phase noise in high frequency YIG oscillators

AssigneeMicro Lambda Wireless, Inc.

InventorOleksandr Chenakin

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Abstract

A dual-resonator YIG oscillator with a main YIG resonator and a stabilizing YIG resonator both suspended in a common magnetic field. The main YIG resonator takes on the high-Q factor aspects of the oscillator, while the stabilizing YIG resonator helps stabilize the operation of the main YIG resonator, and also allows the main YIG resonator operate at higher magnetic field strengths, achieving higher frequency operation. The stabilizing YIG resonator also enables the oscillator's active device to operate in a more linear, lower phase noise, regime. As compared to conventional YIG oscillators, the disclosed dual resonator YIG oscillator provides significant performance improvements, such as higher frequency operation, lower power consumption, higher tuning speed, and lower phase noise.

Claims20

Dependent claims

A YIG oscillator device, comprising:

a stabilizing YIG resonator and a main YIG resonator, both positioned in a common magnetic field, said main YIG resonator having a main Q factor, said stabilizing YIG resonator having a stabilizing Q factor;
said main Q factor being configured to be higher than said stabilizing Q factor;
said stabilizing YIG resonator being magnetically coupled to a stabilizing coupling wire, and said main YIG resonator being magnetically coupled to a main coupling wire, said stabilizing coupling wire and said main coupling wire being electrically connected with at least one active device to form an oscillator circuit;
wherein said main coupling wire is configured to be optimally coupled to said main YIG resonator, and wherein said stabilizing coupling wire is configured to be tightly coupled to said stabilizing YIG resonator;
said YIG oscillator device further configured with said main coupling wire, said main Q factor, said stabilizing coupling wire and said stabilizing Q factor selected so that in operation, said main YIG resonator is a main resonator of said YIG oscillator device, and said stabilizing YIG resonator limits output power of said at least one active device, and keeps said at least one active device under compression, thus reducing phase noise of said oscillator circuit.

2 more elements

A method of reducing phase noise degradation of a YIG oscillator device, said method comprising:

obtaining a stabilizing YIG resonator and a main YIG resonator in a common magnetic field, said main YIG resonator having a main Q factor, said stabilizing YIG resonator having a stabilizing Q factor;
said main Q factor selected to be higher than said stabilizing Q factor;
said stabilizing YIG resonator magnetically coupled to a stabilizing coupling wire, and said main YIG resonator magnetically coupled to a main coupling wire, said stabilizing coupling wire and said main coupling wire being electrically connected with at least one active device to form an oscillation circuit;
wherein said main coupling wire is optimally coupled to said main YIG resonator, and wherein said stabilizing coupling wire is tightly coupled to said stabilizing YIG resonator;
operating said YIG oscillator device, said main coupling wire, said main Q factor, said stabilizing coupling wire and said stabilizing Q factor so that said main YIG resonator is a main resonator of said YIG oscillator device, and said stabilizing YIG resonator limits output power of said at least one active device, and keeps said at least one active device under compression, thus reducing phase noise of said oscillator circuit.

2 more elements

Dependencies are inferred from the claim text.