MEMS Resonator Clock with NEMS Transduction for Stable 20 MHz Signals
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Solution Overview
Problem
Current clock devices, particularly those based on quartz, have low performance in frequency ranges higher than one megahertz, struggling to generate stable clock signals at frequencies of several megahertz or higher.
Innovation Solution
The development of a clock signal generation device utilizing a microelectromechanical resonant element with square-extensional vibration modes, coupled to a substrate via nanoelectromechanical transduction elements, which are designed to enhance frequency stability and transduction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quartz-based clock devices are used, then they are well adapted for frequencies smaller than one megahertz, but they have low performance in frequency ranges higher than one megahertz
Solution Approach 1:
The patent changes the fundamental parameters of the resonant element by transitioning from quartz crystal to microelectromechanical resonator with square-extensional vibration modes. This parameter change enables the device to operate effectively at higher frequencies (1-100 MHz) while maintaining frequency stability, resolving the contradiction between reliability and adaptability across different frequency ranges.
Solution Approach 2:
The patent replaces the traditional quartz-based mechanical resonant system with a microelectromechanical resonator system that uses square-extensional vibration modes. This substitution of the mechanical system enables improved performance at higher frequencies while maintaining the essential clock signal generation function.
2Device complexity
If the resonant element is coupled directly to the substrate, then the structure is simple, but the quality factor and transduction efficiency are reduced
Solution Approach 1:
The patent introduces beams with anchorages as intermediary elements between the resonant element and the substrate. These beams serve as mechanical couplings that isolate the resonant element from direct substrate contact, thereby maintaining high quality factor and transduction efficiency while still providing structural support. This intermediary structure resolves the contradiction between structural simplicity and reliability.
3Ease of manufacture
If conventional transduction elements are used, then the device is easier to manufacture, but the transduction efficiency and signal quality are limited
Solution Approach 1:
The patent employs composite material structures in the transduction elements, combining piezoresistive materials with the microelectromechanical resonator system. This composite approach enables high transduction efficiency and signal quality while remaining compatible with standard semiconductor manufacturing processes, thus resolving the contradiction between ease of manufacture and measurement precision.
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 solution achieves improved frequency stability and transduction efficiency, enabling the generation of high-quality clock signals in the range of 1 MHz to 100 MHz, particularly at frequencies around 20 MHz, thus overcoming the limitations of existing clock devices.
Implementation Method 1
each transduction element is a piezoresistive strain gauge
Implementation Method 2
a microelectromechanical resonant element; the resonant element has square-extensional vibration modes parallel to the surface of the substrate; the resonant element has a natural frequency in the range from 1 MHz to 100 MHz
Data Source
AI summary
The present description concerns a clock signal generation device (902) comprising: a microelectromechanical resonant element (504); and at least one nanoelectromechanical transduction element (512).