Noise Filter Circuit Layout for Stable ESL Cancellation
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Solution Overview
Problem
The existing ESL canceling structure in noise filter circuits is prone to performance deterioration due to interlayer misalignment between loop-shaped conductive patterns, leading to significant variation in mutual inductance and insufficient cancellation of equivalent series inductance (ESL).
Innovation Solution
A noise filter circuit design where the input loop line is disposed inside or outside the output loop line in the thickness direction of a dielectric layer, with both lines being magnetically coupled and having a capacitor connected in series, ensuring consistent mutual inductance even with interlayer misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two loop-shaped conductive patterns are used for ESL cancellation, then mutual inductance is generated to cancel ESL, but interlayer misalignment causes significant variation in mutual inductance and insufficient ESL cancellation
Solution Approach 1:
The input loop line is disposed inside or outside the loop of the output loop line as viewed in the thickness direction of the dielectric layer, creating a nested configuration. This nesting ensures that even when interlayer misalignment occurs, the overlapping area between the loops remains sufficiently large to maintain stable mutual inductance and achieve reliable ESL cancellation.
Solution Approach 2:
The invention utilizes the thickness direction of the dielectric layer as an additional dimension for arranging the loop lines. By disposing the input loop line inside or outside the output loop line in the thickness direction rather than relying solely on planar alignment, the design achieves dimensional diversity that compensates for misalignment effects and stabilizes mutual inductance.
2Productivity
If conventional ESL canceling structure is used, then filter performance can be achieved, but performance deteriorates due to variation in mutual inductance from misalignment
Solution Approach 1:
The nested arrangement of input and output loop lines ensures that the overlapping area remains large even with misalignment, stabilizing the mutual inductance value and maintaining consistent filter performance across manufacturing variations.
Solution Approach 2:
By changing the spatial arrangement parameter of the loop lines from conventional side-by-side positioning to nested positioning in the thickness direction, the invention achieves improved stability of mutual inductance while maintaining the desired filter performance characteristics.
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 configuration stabilizes filter performance by minimizing the variation of mutual inductance due to misalignment, effectively canceling ESL and maintaining filter performance.
Implementation Method 1
The two loop-shaped conductive patterns are connected by a conductive via hole and magnetically coupled to generate a mutual inductance
Implementation Method 2
The magnetically coupled two loop-shaped conductive patterns are described as coupling loops as required below. The ESL is canceled by the mutual inductance generated between the coupling loops
Data Source
AI summary
An input loop line (5) is disposed in a region inside or outside the loop of an output loop line (9) as viewed in the thickness direction of a dielectric layer (2).