Vertical Coupling Hybrid Transformer on Semiconductor Die
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Solution Overview
Problem
Conventional hybrid transformers suffer from inefficiencies in energy transfer due to lateral coupling, which results in small coupling coefficients, large area occupation, and asymmetrical windings, limiting their performance and efficiency.
Innovation Solution
A vertical coupling hybrid transformer structure is implemented within a semiconductor die with multiple layers, where energy is transferred between windings on different layers, utilizing a substrate with dielectric layers to enhance efficiency and compactness, and potentially using low-k dielectric materials to reduce TX-RX leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lateral coupling is used in hybrid transformers, then the structure is simpler to manufacture, but the coupling coefficient is small and the area occupied is large
Solution Approach 1:
The patent transitions from lateral coupling (horizontal arrangement) to vertical coupling (vertical arrangement across multiple layers). The windings are positioned on different layers of the semiconductor die, with first windings on a first layer and second windings on a second layer, enabling energy transfer in the vertical dimension. This resolves the area occupation problem by utilizing the third dimension (depth) rather than expanding horizontally.
2Ease of manufacture
If lateral coupling is used in hybrid transformers, then the structure is simpler to manufacture, but the coupling coefficient is small
Solution Approach 1:
By moving the coupling interaction from the lateral dimension to the vertical dimension across multiple layers, the patent achieves stronger magnetic coupling. The vertical arrangement allows for optimized spacing and alignment between windings on different layers, significantly improving the coupling coefficient compared to lateral coupling constrained by single-layer geometry.
3Reliability
If vertical coupling is used with multiple layers, then the coupling coefficient increases and area is reduced, but the device complexity increases
Solution Approach 1:
The patent divides the transformer structure into multiple layers, with each layer containing specific windings and interconnects. The first windings and second windings are separated onto different layers, allowing independent optimization of each winding set while achieving strong vertical coupling. This segmentation manages complexity by organizing components into distinct, manufacturable layers.
Solution Approach 2:
The multiple layers serve multiple functions: they provide physical separation of windings for reduced interference, enable vertical coupling for improved performance, and allow independent routing of interconnects to different ports. The layered structure universally supports both the electrical functionality and the manufacturing process requirements.
4Area of moving object
If vertical coupling is used, then area occupation is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent utilizes the vertical dimension by implementing windings on multiple layers stacked above each other. This approach consolidates what would otherwise require large horizontal spacing into a compact vertical arrangement, dramatically reducing the area occupation while the layer-by-layer manufacturing process remains compatible with standard semiconductor fabrication techniques.
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 approach leads to improved energy transfer efficiency, higher inductor Q factors, and a more compact design compared to lateral coupling transformers, offering enhanced TX-RX isolation and reduced insertion losses.
Implementation Method 1
A vertical coupling hybrid transformer structure is implemented within a semiconductor die with multiple layers, where energy is transferred between windings on different layers
Implementation Method 2
utilizing a substrate with dielectric layers to enhance efficiency and compactness, and potentially using low-k dielectric materials to reduce TX-RX leakage
Data Source
AI summary
Several novel features pertain to a hybrid transformer formed within a semiconductor die having multiple layers. The hybrid transformer includes a first set of windings positioned on a first layer of the die. The first layer is positioned above a substrate of the die. The first set of windings includes a first port and a second port. The first set of windings is arranged to operate as a first inductor. The hybrid transformer includes a second set of windings positioned on a second layer of the die. The second layer is positioned above the substrate. The second set of windings includes a third port, a fourth port and a fifth port. The second set of windings is arranged to operate as a second inductor and a third inductor. The first set of windings and the second set of windings are arranged to operate as a vertical coupling hybrid transformer.