Distributed LC Filter Structure Using Parasitic Coupling
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Solution Overview
Problem
Existing integrated filter structures for IoT applications face challenges in efficient integration of inductance and capacitance components due to technological limitations and parasitic effects, leading to inefficient heterogeneous integration and limited performance at high frequencies.
Innovation Solution
A distributed LC filter structure is developed, which integrates both inductance and capacitance in a single structure by tailoring interconnections to leverage parasitic effects, eliminating discrete passive elements and achieving homogeneous integration, thereby enhancing filtering performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discrete inductor and capacitor devices are used for filtering, then filtering performance can be achieved, but integration efficiency is poor and device complexity increases
Solution Approach 1:
The patent merges the inductor and capacitor into a single integrated structure where metal layers provide both inductance and capacitance functions simultaneously. This eliminates the need for separate discrete passive components, achieving homogeneous integration and reducing device complexity while improving manufacturing efficiency.
Solution Approach 2:
The metal layers in the integrated circuit are designed to serve multiple functions: they provide both inductive and capacitive properties within the same structural elements. This multi-functionality allows a single structure to replace multiple discrete components, enhancing integration efficiency without increasing device complexity.
2Ease of manufacture
If conventional discrete components are integrated in package, then some integration is achieved, but technological limitations and parasitic effects prevent efficient integration
Solution Approach 1:
The patent converts the parasitic inductance inherent in capacitor interconnections into a useful feature by designing the interconnection structure to provide both capacitive and inductive functions intentionally. Instead of treating parasitic effects as harmful, the design leverages them to achieve the desired filtering performance while maintaining reliability.
Solution Approach 2:
The patent changes the design parameters by moving from treating inductance and capacitance as separate, optimized components to designing a unified structure where both properties emerge from the same metal interconnections. This parameter change enables efficient integration by eliminating the need to minimize parasitic effects through separate component optimization.
3Reliability
If inductor and capacitor are optimized separately, then each component achieves its optimal performance, but heterogeneous integration becomes inefficient
Solution Approach 1:
The patent combines the optimization of inductor and capacitor into a single unified design process. The metal layers are designed to provide both inductive and capacitive functions simultaneously, eliminating the need for separate optimization steps and achieving homogeneous integration that improves manufacturing efficiency while maintaining component performance.
4Productivity
If discrete passive elements are used, then filtering function is achieved, but device size and integration density are limited
Solution Approach 1:
The patent merges multiple discrete passive elements into a single integrated structure where metal layers provide both inductance and capacitance. This dramatically increases integration density by eliminating the need for separate discrete elements while reducing device complexity through homogeneous integration of filtering functions.
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 solution enables high-efficiency filtering with improved inductance and capacitance values, achieving greater filtering performance and efficiency, particularly at high frequencies, while maintaining a compact and homogenous integration suitable for IoT applications.
Implementation Method 1
tailor the interconnections between the distributed inductance and capacitance to leverage this parasitic inductance to increase the overall inductance of the distributed LC filter structure
Implementation Method 2
the interconnections between the distributed inductance and capacitance are tailored to leverage the parasitic capacitance resulting from the distributed inductance to add up with the distributed capacitance
Data Source
AI summary
A distributed LC filter structure is disclosed. The distributed LC filter structure provides simultaneously a distributed inductance and a distributed capacitance in the same structure. Accordingly, discrete passive elements are eliminated and high, homogenous integration is achieved. Interconnections between the distributed inductance and the distributed capacitance are tailored to leverage a parasitic inductance of the distributed capacitance to increase the overall inductance of the distributed LC filter structure. Similarly, the interconnections are tailored to leverage a parasitic capacitance resulting from the distributed inductance to add up with the distributed capacitance augmenting the overall capacitance of the structure.