Tuned oscillator utilizing thin film ferromagnetic resonator
First Claim
1. A tuned oscillator utilizing a thin film ferromagnetic resonator comprising;
- an active element for oscillation,a tin film ferromagnetic resonance element formed of a thin film ferromagnetic plate and a transmission line coupled to said thin film ferromagnetic plate and connected to said active element as a part of a feed back circuit for said active element,bias magnetic field means applying a bias magnetic field perpendicular to said thin film ferromagnetic plate, anda PLL (phase lock loop) circuit receiving an oscillation output and generating a control signal to stabilize the oscillation,said bias magnetic field means being formed of a permanent magnet which generates a fixed bias magnetic field component and a coil which generates a variable bias magnetic field component, said coil being fed with a current which is controlled by said control signal which is obtained from said PLL circuit.
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Abstract
A tuned oscillator utilizing a thin film ferromagnetic resonator is disclosed. The oscillator comprises an active element for oscillator and a YIG thin film resonator connected to the active element as a part of feed-back circuit for the active element. The YIG thin film resonator is applied with a bias magnetic field perpendicular to a surfce of a YIG disk which is generated by a permanent magnet for a fixed component and a coil for a variable component for the resonance frequency. The resonance frequency is stabilized by use of a PLL circuit connected to an output of the oscillator and feeding back to the coil. Since the YIG thin film tuned oscillator has a high Q value, high quality communication signal processing can be achieved. The YIG tuned oscillator is used as local oscillator for a transciever.
46 Citations
4 Claims
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1. A tuned oscillator utilizing a thin film ferromagnetic resonator comprising;
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an active element for oscillation, a tin film ferromagnetic resonance element formed of a thin film ferromagnetic plate and a transmission line coupled to said thin film ferromagnetic plate and connected to said active element as a part of a feed back circuit for said active element, bias magnetic field means applying a bias magnetic field perpendicular to said thin film ferromagnetic plate, and a PLL (phase lock loop) circuit receiving an oscillation output and generating a control signal to stabilize the oscillation, said bias magnetic field means being formed of a permanent magnet which generates a fixed bias magnetic field component and a coil which generates a variable bias magnetic field component, said coil being fed with a current which is controlled by said control signal which is obtained from said PLL circuit. - View Dependent Claims (2, 3, 4)
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Specification