Ceramic Resonator RF Oscillator Packaging for Stable High Frequencies
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Solution Overview
Problem
Existing semiconductor devices using quartz crystals for oscillators face challenges such as increased size, mechanical sensitivity, and RF instability due to wire bonding, which are exacerbated at higher frequency ranges.
Innovation Solution
The integration of a ceramic resonator with a conductive rod and periphery, allowing for surface mounting of an integrated circuit package, thereby reducing spurious capacitances and inductances and enhancing RF stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quartz crystals are used for RF oscillators, then stable frequency generation is achieved, but mechanical sensitivity and RF instability increase
Solution Approach 1:
The patent changes the resonator material from quartz crystal to ceramic resonator, fundamentally altering the physical parameters of the resonating structure. This material substitution eliminates mechanical sensitivity while maintaining frequency stability, as ceramic materials are less susceptible to mechanical stress and environmental factors that affect quartz crystals.
Solution Approach 2:
The patent replaces the mechanical wire bonding system with a direct surface-mount integration system. The ceramic resonator is directly mounted to the substrate with conductive traces, eliminating the mechanical wire bonds that cause RF instability. This substitution removes the mechanical connection layer that introduces inductance and susceptibility to vibration.
2Reliability
If traditional oscillator packaging is used, then component protection is achieved, but spurious capacitances and inductances increase
Solution Approach 1:
The patent merges the resonator, substrate, and circuit interconnections into a single integrated structure. The ceramic resonator is directly mounted on the substrate with conductive traces that serve as both structural and electrical elements, eliminating separate wire bonds and packaging components. This integration removes the parasitic capacitances and inductances introduced by traditional packaging layers.
Solution Approach 2:
The patent extracts and eliminates the wire bonding layer from the oscillator structure. By using direct surface-mount integration with conductive traces on the substrate, the patent removes the external wire bonds that introduce spurious inductances and capacitances, simplifying the electrical path between the resonator and active circuit elements.
3Productivity
If miniaturization is pursued for active components, then computing power density increases, but integration of passive resonators becomes difficult
Solution Approach 1:
The patent transitions from three-dimensional wire bonding integration to a two-dimensional surface-mount integration approach. The ceramic resonator is mounted directly on the substrate surface with conductive traces providing electrical connections, enabling compact planar integration that accommodates miniaturized active components without the height and complexity of wire bonds.
Solution Approach 2:
The patent segments the oscillator into distinct functional modules: the ceramic resonator module and the active circuit module on the substrate. This segmentation allows independent optimization of each component size while maintaining simple integration through surface-mount technology, facilitating overall miniaturization without increasing integration complexity.
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 enables the production of compact, stable RF oscillators with high-quality factors, suitable for high-frequency applications, while minimizing mechanical sensitivity and RF instability issues.
Implementation Method 1
an integrated ceramic resonator including a plurality of conductive walls forming a conductive periphery of a ceramic cavity in the ceramic substrate, a conductive rod extending vertically at least partially into the ceramic cavity
Implementation Method 2
a first conductive material extending vertically through the upper planar surface of the ceramic substrate for connecting the conductive periphery of the ceramic cavity to the surface mounted integrated circuit package housing the active oscillator circuit
Data Source
AI summary
In an aspect, an apparatus is disclosed that includes a surface-mounted integrated circuit package housing an active oscillator circuit; an integrated ceramic resonator formed from a ceramic substrate having an upper planar surface receiving the surface-mounted integrated circuit package, the integrated ceramic resonator including a plurality of conductive walls forming a conductive periphery of a ceramic cavity in the ceramic substrate, a conductive rod extending vertically into the ceramic cavity, wherein the conductive rod is isolated from contact with the conductive periphery of the ceramic cavity, a first conductive material extending vertically through the upper planar surface of the ceramic substrate for connecting the conductive periphery of the ceramic cavity to the surface-mounted integrated circuit package housing the active oscillator circuit; and a second conductive material extending through the upper planar surface of the ceramic substrate for connecting the conductive rod to the surface-mounted integrated circuit package.