Integrated Filter with Vertical Ground Plane for Inter-Channel Coupling
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Solution Overview
Problem
Semiconductor-based filter designs face challenges in minimizing size while reducing inter-channel coupling effects, particularly with the presence of inductor structures that increase the likelihood of undesired inter-channel coupling.
Innovation Solution
The integration of stacked or multi-layer inductor structures with floating capacitors and transient voltage suppression (TVS) devices, combined with a vertical ground plane or ground ring, to form a compact filter structure that minimizes cross-coupling between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductor structures are used in filter design, then filtering functionality is achieved, but inter-channel coupling increases
Solution Approach 1:
A ground plane structure is introduced as an intermediary element between adjacent filter channels. This ground plane acts as a shield that redirects electromagnetic fields, preventing coupling between channels while maintaining the inductor-based filtering functionality. The ground plane is connected to ground potential and positioned to intercept stray fields from inductors.
Solution Approach 2:
The solution moves from a two-dimensional planar layout to a three-dimensional structure by adding vertical ground planes and multiple stacking layers. This dimensional transition allows inductors to be positioned in different vertical levels, reducing planar proximity effects and inter-channel coupling while preserving filtering performance.
2Area of stationary object
If multiple channels are integrated in smaller space, then device size is reduced, but inter-channel coupling increases
Solution Approach 1:
Multiple filter channels are nested in a vertical stacking configuration rather than being placed side-by-side in the planar domain. Inductors and capacitors are arranged in multiple layers stacked vertically, with ground planes separating each layer. This nesting approach dramatically reduces the horizontal footprint while using vertical separation to minimize coupling.
Solution Approach 2:
The integration strategy transitions from lateral placement to vertical stacking, utilizing the third dimension (height) to accommodate multiple channels. This dimensional change enables higher density integration while maintaining channel isolation through vertical ground plane barriers.
3Object-generated harmful factors
If ground plane structure is added to reduce coupling, then inter-channel coupling is reduced, but device complexity increases
Solution Approach 1:
The ground plane structure serves multiple functions simultaneously: it acts as an electromagnetic shield to reduce coupling, provides a reference potential plane for signal stability, and serves as part of the capacitor structure in the filter circuit. This multi-functionality reduces the need for additional dedicated shielding elements, thereby limiting complexity growth.
Solution Approach 2:
The ground plane is merged with the capacitor structure and power/ground distribution network, combining several functions into a single integrated element. This merging approach reduces the total number of discrete components and simplifies the overall device architecture despite the added coupling mitigation capability.
Data Source
AI summary
In one embodiment, a filter structure includes first and second filter devices formed using a semiconductor substrate. A vertical ground plane structure prevents cross-coupling between the first and second filter devices.