Distributed Transconductance Resonator for Stable Tuned Frequency
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Solution Overview
Problem
Conventional resonators with large capacitor arrays face issues due to the breakdown of lumped element assumptions, leading to parasitic resonances and reduced efficiency in achieving desired resonant frequencies, especially in high-frequency applications like software defined radios and millimeter-wave oscillators.
Innovation Solution
The use of distributed transconductance elements within resonators, strategically placed among switched impedances, to suppress parasitic resonances and ensure a dominant resonant mode with a narrowband bandpass response, thereby reducing parasitic modes' impact and enhancing frequency selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large capacitor arrays are used in conventional resonators, then the resonator can achieve desired resonant frequencies, but parasitic resonances occur and efficiency is reduced
Solution Approach 1:
The patent divides the single large capacitor array into multiple smaller capacitor arrays arranged in a distributed configuration. This segmentation reduces the parasitic inductance associated with each capacitor array, thereby suppressing parasitic resonances while maintaining the desired resonant frequency through coordinated switching of the distributed arrays.
Solution Approach 2:
The patent transitions from a lumped element model to a distributed model by arranging capacitor arrays in multiple dimensions across the resonator structure. This spatial distribution changes the electrical characteristics, reducing the impact of parasitic inductance and enabling better control over parasitic resonances through the geometric arrangement of the distributed elements.
2Device complexity
If lumped element assumptions are used in resonators, then circuit analysis is simplified, but the assumptions break down at high frequencies leading to reduced efficiency
Solution Approach 1:
The patent employs dynamic switching of the distributed capacitor arrays to achieve the desired resonant frequency. By selectively switching groups of distributed capacitors in and out of the circuit, the resonator can dynamically adjust its capacitance while maintaining the distributed architecture that suppresses parasitic resonances, thus preserving efficiency at high frequencies.
Solution Approach 2:
The patent changes the electrical parameters of the resonator by distributing the capacitance across multiple arrays and selectively switching them. This parameter change transforms the resonator from a lumped element structure to a distributed structure, altering the frequency response characteristics and eliminating the breakdown of lumped element assumptions at high frequencies.
3Adaptability or versatility
If switched impedances are used to tune resonant frequencies, then frequency selectivity can be achieved, but parasitic modes are not suppressed effectively
Solution Approach 1:
The patent applies local quality by distributing different capacitor arrays with potentially different characteristics across the resonator structure. Each local region has its own switched impedance elements that contribute to the overall frequency tuning capability while the distributed arrangement ensures that parasitic modes are suppressed through the collective effect of all distributed elements.
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 approach effectively minimizes parasitic resonances, ensuring the desired resonant frequency has a larger transconductance while parasitic modes are pushed to higher frequencies with lower amplitudes, improving the performance of resonators and filters in reconfigurable and wide-tuning applications.
Implementation Method 1
a corresponding plurality of transconductance elements distributed within respective distances among the switched impedances
Implementation Method 2
The resonator has a given desired resonant frequency and a given amplitude of response
Data Source
AI summary
A method includes forming a resonator comprising a plurality of switched impedances spatially distributed within the resonator, selecting a resonant frequency for the resonator, and distributing two or more transconductance elements within the resonator based on the selected resonant frequency. Distributing the two or more transconductance elements may include non-uniformly distributing the two or more transconductance elements within the resonator.