SSH Circuit Lattice Layout for Stable Natural Frequencies
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Solution Overview
Problem
SSH circuits face challenges in maintaining frequency stability and efficient band-pass filtering due to variations in inductance and capacitance values, affecting the consistency of natural frequencies and impedance characteristics.
Innovation Solution
The SSH circuit design incorporates an uneven shape for unit lattices in two-dimensional and three-dimensional configurations, either by forming an uneven section on the peripheral edges or reducing characteristic variations of elements at the edges, to suppress the variation coefficient of natural frequencies, thereby enhancing frequency stability and filtering performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete inductors and capacitors are used to construct the SSH circuit, then the circuit exhibits topological protection and band-pass filtering properties, but variations in inductance and capacitance values cause frequency instability and inconsistent natural frequencies
Solution Approach 1:
The patent transforms the discrete circuit parameters (inductance and capacitance values) into continuous geometric parameters (edge lengths of unit lattices). By changing the physical dimensions of the circuit layout rather than component values, the system achieves frequency stability while being tolerant of manufacturing variations. The natural frequency becomes determined by the overall circuit geometry rather than by precise component values.
Solution Approach 2:
The patent replaces the electrical component-based system (inductors and capacitors with specific L and C values) with a geometry-based system where the circuit topology and physical dimensions determine the electrical characteristics. This substitution allows the system to achieve precision through geometric design rather than through precise component manufacturing.
2Manufacturing precision
If the SSH circuit uses regular symmetric unit lattice arrangements, then the circuit structure is simple and easy to manufacture, but the natural frequencies exhibit high variation coefficients due to element variations
Solution Approach 1:
The patent introduces asymmetric variations in the edge lengths of unit lattices within the SSH circuit. By making the geometric parameters asymmetric rather than uniform, the system compensates for manufacturing variations and reduces the variation coefficient of natural frequencies. The asymmetric geometry creates a more robust system that is less sensitive to parameter variations.
Solution Approach 2:
The patent applies different geometric parameters (edge lengths) to different parts of the circuit structure. Rather than using a uniform lattice throughout, specific regions have tailored dimensions that optimize the overall frequency stability. This local variation in geometric quality allows the system to achieve better performance while maintaining a relatively simple overall structure.
Data Source
AI summary
An SSH circuit includes a plurality of unit lattices, each unit lattice including unit circuits. Each unit circuit includes two first inductors, a second inductor connected in series between the two first inductors, and two capacitors connected between a ground potential and two respective connection nodes at which the first and second inductors are connected to each other, an inductance of the second inductor being larger than that of the first inductors. In each unit lattice, the two connection nodes of each unit circuit are arranged at respective vertexes of both ends of each side forming a hyperrectangle, and the connection nodes arranged at each vertex being connected to each other and sharing the corresponding capacitor. The unit lattices are connected to each other by a mutual sharing of the first inductors by two unit lattices adjacent to each other. A peripheral edge has an uneven shape of unit lattices.