Magnetoresistive RF Oscillator With In-Phase Feedback Reinjection
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Solution Overview
Problem
Existing radiofrequency oscillators face challenges in improving the quality factor and reducing electrical consumption, particularly in magnetoresistive devices used in radio telecommunications.
Innovation Solution
Incorporating a feedback loop with an amplifier that reconnects an amplified part of the oscillating signal to the control terminal in phase with the output signal, along with a magnetic field generator to control the oscillation frequency and amplitude, while maintaining current intensity below the critical threshold to limit power consumption and enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the current intensity is increased to generate sustained oscillations, then the oscillation amplitude increases, but the electrical consumption increases and the device operates above the critical threshold
Solution Approach 1:
The patent implements a feedback loop that takes a portion of the oscillating signal from the output terminal, amplifies it, and reinjects it into the control terminal in phase with the original signal. This feedback mechanism allows the system to generate sustained oscillations with sufficient amplitude while maintaining the current intensity below the critical threshold, thereby reducing electrical consumption compared to operating above threshold
Solution Approach 2:
The patent uses partial action by injecting only a portion of the amplified oscillating signal into the control terminal rather than requiring full current intensity. This partial reinforcement is sufficient to maintain sustained oscillations while keeping the overall current below the critical threshold, optimizing the balance between oscillation amplitude and electrical consumption
2Reliability
If a feedback loop with amplifier is added to enhance quality factor, then the oscillation stability improves, but the device complexity increases
Solution Approach 1:
The control terminal serves multiple functions: it controls the magnetoresistive device operation and also receives the amplified feedback signal. This multi-functionality approach enhances the quality factor through feedback while minimizing additional circuit complexity by reusing existing terminals rather than adding dedicated feedback input terminals
Solution Approach 2:
The amplifier acts as an intermediary element that bridges the output terminal and control terminal. It takes the oscillating signal from the output, amplifies it, and reinjects it into the control terminal in phase. This intermediary approach allows quality factor enhancement while keeping the feedback path simple and integrated into the existing device architecture
3Use of energy by moving object
If the current intensity is maintained below the critical threshold, then the electrical consumption is reduced, but the oscillation sustainability becomes challenging
Solution Approach 1:
The feedback loop ensures continuous reinforcement of the oscillating signal by continuously taking output signal, amplifying it, and reinjecting it into the control terminal in phase. This continuous action compensates for energy losses and maintains sustained oscillations even when the current intensity remains below the critical threshold, ensuring long-term oscillation sustainability without excessive energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the quality factor of the oscillator, reduces electrical consumption, and allows for more sensitive magnetoresistive device usage by maintaining sustained oscillations and minimizing phase delay, thereby improving the overall performance and efficiency of the radiofrequency oscillator.
Implementation Method 1
Radiofrequency oscillators integrate a magnetoresistive device within which a spin-polarized electrical current flows. In such an oscillator, the passage of the current prompts a periodic variation in the resistance of the magnetoresistive device.
Implementation Method 2
Spin electronics uses the spin of the electrons as an additional degree of freedom in order to generate novel effects. The spin polarization of an electrical current results from the asymmetry existing between the diffusion of the spin-up type conduction electrons and spin-down type conduction electrons.
Implementation Method 3
passing a spin-polarized current through a thin magnetic layer can induce a reversal of its magnetization when there is no external magnetic field. Polarized current can also generate sustained magnetic excitations, also known as oscillations.
Implementation Method 4
The U.S. Pat. No. 5,695,864 describes various developments implementing the physical principle mentioned here above. It describes especially the precession of the magnetization of a magnetic layer through which a spin-polarized electrical current flows.
Implementation Method 5
a feedback loop, the input of which is connected to the output terminal so as to amplify the part of the oscillating signal picked up at the output terminal, and the output of which is connected to the control terminal so as to inject, into this control terminal, an amplified part of the oscillating signal in phase with the oscillating signal generated at the output terminal.
Data Source
AI summary
The invention relates to a radiofrequency oscillator which incorporates: a spin-polarized electric current magnetoresistive device (6) for generating an oscillating signal at an oscillation frequency on an output terminal (10), and a terminal (18) for controlling the frequency or amplitude of the oscillating signal, and a feedback loop (44) comprising an amplifier (46) provided with: an input connected to the output terminal (10) of the magnetoresistive device (6) so as to amplify the portion of an oscillating signal detected at the output terminal, and an output connected to the control terminal (18) so as to inject onto said control terminal the amplified portion of the oscillating signal which is phase-related to the oscillating signal generated at the output terminal.