Distributed Transconductance Resonator Layout for Parasitic Mode Suppression
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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 inefficiencies in achieving a desired resonant frequency, especially at high frequencies where interconnects contribute parasitic inductances, affecting performance in applications like software defined radios and filters.
Innovation Solution
The use of distributed transconductance elements across multiple nodes in the resonator, allowing for non-uniform distribution based on the size and location of capacitors to prioritize the desired resonant mode while minimizing parasitic modes, thereby reducing parasitic resonances and enhancing frequency selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If lumped element assumptions are used in conventional resonators with large capacitor arrays, then the design and analysis become simpler, but parasitic resonances occur and the desired resonant frequency cannot be achieved accurately at high frequencies
Solution Approach 1:
The patent segments the resonator into distributed elements (capacitors, inductors, and transconductance elements) arranged in a specific spatial configuration. Instead of treating the resonator as a single lumped element, it divides the structure into multiple discrete components with defined positions and values, allowing accurate modeling of high-frequency behavior and suppression of parasitic resonances while maintaining manageable design complexity through systematic synthesis methods.
2Adaptability or versatility
If large capacitor arrays are used in resonators, then the resonator can achieve the desired resonant frequency range, but interconnect parasitic inductances affect performance and cause parasitic resonances
Solution Approach 1:
The patent introduces transconductance elements as intermediary components between the capacitive elements. These transconductance elements act as active compensating elements that counterbalance the parasitic inductances introduced by interconnects. By positioning and sizing these intermediary elements strategically, the patent eliminates the harmful effects of parasitic inductances while preserving the wide frequency tuning capability provided by the capacitor arrays.
3Device complexity
If conventional resonator designs are used, then the structure is simpler, but frequency selectivity is poor due to parasitic resonances and inefficiencies
Solution Approach 1:
The patent applies local quality by assigning different properties to different parts of the resonator structure. Specifically, transconductance elements are strategically positioned at specific locations within the resonator where they provide localized compensation for parasitic effects. This non-uniform distribution of active elements enhances frequency selectivity at critical points without requiring complete redesign of the entire structure, thus improving performance with moderate increases in complexity.
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.