Inductive MEMS Oscillator for Low-Voltage IC Integration
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Solution Overview
Problem
Quartz crystal oscillators, despite their stability and high quality factor, are bulky and not well-suited for integration into semiconductor substrates, and previous MEMS-based oscillators require high voltages and non-standard ferromagnetic materials, making them incompatible with modern IC technologies.
Innovation Solution
A micro-electromechanical system (MEMS) device with inductive elements, including a first and second inductive element, where the second element is moveable, generates an oscillating signal by converting mechanical vibration into an electric signal using low voltages, allowing integration into semiconductor substrates without exotic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quartz crystal oscillators are used for generating reference frequency, then stability and quality factor are improved, but device size increases making integration into semiconductor substrates difficult
Solution Approach 1:
The patent replaces the mechanical quartz crystal oscillator system with an integrated circuit-based oscillator system. The mechanical resonance of quartz crystals is substituted with electronic oscillation circuits that can be fabricated using standard semiconductor manufacturing processes, enabling miniaturization while maintaining frequency generation functionality.
Solution Approach 2:
The patent creates a universal oscillator circuit design that can be integrated into various semiconductor substrates and configured for different frequency requirements. The circuit uses standard electronic components that can be manufactured across different process nodes, making the solution broadly applicable to various electronic devices rather than requiring device-specific custom designs.
2Volume of moving object
If MEMS-based oscillators are used for integration into semiconductor substrates, then device size is reduced, but high voltages and non-standard ferromagnetic materials are required making them incompatible with modern IC technologies
Solution Approach 1:
The patent changes the operating voltage parameters from high voltages (required by conventional MEMS oscillators) to low voltages compatible with standard IC processes (e.g., 3.3V, 5V, or lower). This parameter change enables the use of standard semiconductor manufacturing techniques while maintaining the miniaturized form factor.
Solution Approach 2:
The patent uses homogeneous materials and manufacturing processes that are consistent with standard semiconductor fabrication. Instead of requiring non-standard ferromagnetic materials, the design employs conventional semiconductor materials (silicon, metal interconnects, insulators) that can be processed using established CMOS or bipolar fabrication techniques, ensuring material and process homogeneity across the industry.
3Ease of manufacture
If electrostatic effects are used for oscillator design, then integration into substrates is possible, but relative high voltages are required that are not easily compatible with modern IC technologies
Solution Approach 1:
The patent replaces electrostatic actuation mechanisms with electromagnetic or resistive heating mechanisms that can operate at lower voltages. The electrostatic force generation requiring high voltages is substituted with alternative physical mechanisms that are compatible with standard IC voltage levels, maintaining integration capability while reducing energy requirements.
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
The MEMS device enables the integration of oscillators into semiconductor substrates using standard processing techniques, achieving low voltage operation, miniaturization, and high quality factor oscillations, suitable for various electronic applications requiring accurate reference frequencies.
Implementation Method 1
providing an alternating current in a first inductive element fixed to a substrate and at least a second inductive element fixed to a moveable element in order to generate a mechanical vibration
Implementation Method 2
converting the mechanical vibration into an electric oscillating signal
Data Source
AI summary
An electronic device for generating an electric oscillating signal is described based on a micro-electromechanical system (MEMS). The electronic device typically comprises a substrate a moveable element which is moveable with respect to the substrate and an actuating means and a sensor. The actuating means is used to induce vibration of the moveable element and comprises two inductive elements, a first one provided fixed to the substrate and a second one provided fixed to the moveable element. The induced vibration of the moveable element is sensed using the sensor and converted into an electric oscillating signal.