Via Connection Structure with Compensative Area for Impedance Matching
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Solution Overview
Problem
The existing via connection structures in RF circuits suffer from impedance mismatch due to variations in parasitic capacitance and inductance, leading to signal reflection and potential system malfunctions.
Innovation Solution
A via connection structure with a compensated non-conductive area on the reference plane is introduced to reduce parasitic capacitance between conductive lines and reference planes, ensuring impedance matching by modifying the design to include a non-conductive clearance and compensative area adjacent to the via connection structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a via connection structure is used to interconnect conductive layers, then electrical connection between layers is achieved, but characteristic impedance deviation occurs causing signal reflection
Solution Approach 1:
The via connection structure is segmented into multiple components: via body, via pad, compensation capacitor, and grounding structure. Each segment addresses specific impedance issues independently, allowing the overall structure to achieve better impedance matching by dividing the complex impedance control task into manageable parts
Solution Approach 2:
A compensation capacitor is introduced as an intermediary element between the via pad and the reference plane. This capacitor acts as a mediator to cancel out the parasitic capacitance of the via structure, thereby improving impedance matching without requiring fundamental changes to the via connection itself
2Reliability
If a compensation capacitor is added to reduce parasitic capacitance, then impedance matching improves, but device complexity increases
Solution Approach 1:
The compensation capacitor is merged with the existing via pad structure, forming an integrated via connection structure. This combining approach reduces the number of separate components and simplifies the manufacturing process while maintaining the impedance matching benefits
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 compensative area effectively reduces parasitic capacitance, improving signal quality and matching impedance, resulting in enhanced signal propagation and reduced system malfunctions across various frequency ranges.
Implementation Method 1
The parasitic capacitance and the parasitic inductance of the via connection structure depend on the dielectric constant of the insulation layer, the thickness of the insulation layer, and the dimensions of the via connection structure
Implementation Method 2
The via connection structure comprises at least one via which is filled with the conductive material or is covered with the conductive material on the sidewall to electrical connect two different conductive layers
Data Source
AI summary
The invention discloses a via connection structure with compensative area on a reference plane. The substrate has several conductive layers isolated by the insulation layers. When two conductive lines formed on different conductive layers where a reference plane is sandwiched in, these two conductive lines are not electrical connected because of the insulation layers. Furthermore, a via connection structure is common used to connect these two conductive lines. When a non-conductive area, i.e. the compensative area, on the reference plane is overlapped with a portion of one conductive line and is close to the via connection structure, it compensates the capacitive effect of the via connection structure. By this compensative area and the variety of the via connection structure, the vertical connection between different layers has a well impedance-matched condition and transmits the signal correctly.