On-Chip Cavity Resonator for High Q-Factor
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Solution Overview
Problem
Existing high frequency oscillation circuits face challenges in achieving a high quality factor (Q-factor) of at least 100, which is necessary for low phase noise and high selectivity, especially at frequencies above 10 GHz, and in the millimeter wave or terahertz range, where conventional LC circuits and external cavity resonators are inadequate due to space and manufacturing complexity.
Innovation Solution
An integrated cavity resonator is integrated with high frequency electrical circuitry on a semiconductor chip, featuring a resonator body with a metal layer and a feeding structure, which allows for a Q-factor of at least 100 within a compact form factor, reducing physical space and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LC circuits are used for high frequency oscillation, then the circuit can be manufactured with standard processes, but the quality factor (Q-factor) cannot reach at least 100, resulting in high phase noise and low selectivity
Solution Approach 1:
The patent merges the cavity resonator structure with the semiconductor chip substrate, integrating what would traditionally be separate components. The resonator body is formed within a cavity in the semiconductor substrate, combining the functions of the resonator and the mounting structure into a single integrated unit, thereby achieving high Q-factor without increasing manufacturing complexity
Solution Approach 2:
The patent transitions from planar LC circuits to a three-dimensional cavity structure by etching a cavity into the semiconductor substrate and forming a resonator body within it. This vertical dimensionality change enables the achievement of high Q-factor (at least 100) that cannot be obtained with conventional two-dimensional LC circuits operating at frequencies above 10 GHz
2Reliability
If external cavity resonators are used to achieve high Q-factor, then low phase noise and high selectivity can be achieved, but the physical space requirements and assembly complexity increase significantly
Solution Approach 1:
The patent combines the cavity resonator with the semiconductor chip into a single integrated device. The resonator body is formed within a cavity in the semiconductor substrate, eliminating the need for separate external cavity resonators and their associated mounting structures, thereby reducing assembly complexity while maintaining high Q-factor
Solution Approach 2:
The resonator body is nested within the cavity in the semiconductor substrate, creating a compact hierarchical structure. This nesting approach allows the resonator to be contained within the chip footprint, reducing physical space requirements and eliminating the need for external mounting of separate cavity resonators
3Reliability
If external cavity resonators are used, then high Q-factor can be achieved, but the physical space requirements increase due to large waveguide requirements
Solution Approach 1:
The resonator body is nested within the cavity in the semiconductor substrate, creating a compact hierarchical structure. This nesting approach allows the resonator to be contained within the chip footprint, reducing physical space requirements and eliminating the need for external mounting of separate cavity resonators
Solution Approach 2:
The patent utilizes the vertical dimension by etching a cavity into the semiconductor substrate and forming a three-dimensional resonator body within it. This approach achieves high Q-factor without increasing the planar footprint of the device, as the resonator volume is formed in the depth direction rather than expanding the surface area
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 integrated cavity resonator achieves high Q-factors and reduced physical space requirements, enabling applications from 10 GHz to 10 THz, such as in spectroscopic sensors, with amplified oscillation amplitude and energy condensation at a smaller volume, eliminating the need for large waveguides.
Implementation Method 1
the resonator body contains the electromagnetic waves as the electromagnetic waves reflect back and forth between walls of the resonator body
Implementation Method 2
Standing waves are formed in the cavity when the electromagnetic waves are at a resonant frequency of the cavity resonator
Implementation Method 3
a feeding structure formed in the semiconductor substrate to feed a high frequency signal to the cavity resonator
Data Source
AI summary
A semiconductor chip may include high frequency electrical circuitry. The semiconductor chip may include a cavity resonator integrated with the high frequency electrical circuitry in a semiconductor substrate of the semiconductor chip. The cavity resonator may include a resonator body in a cavity in the semiconductor substrate of the semiconductor chip. The resonator body may comprise a metal layer. The cavity resonator may include a feeding structure electrically connected to the high frequency electrical circuitry.