Transformer Power Splitter Series-Parallel Topology for mmWave Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
On-chip transformer power splitters and combiners in silicon technology suffer from capacitive coupling issues, leading to degraded power combining and splitting efficiency, system instability, and imbalanced impedance, particularly at high frequencies like mmWave applications, due to the trade-off between transformer efficiency and power combining/splitting efficiency.
Innovation Solution
The implementation of a transformer power splitter with primary winding conductors magnetically coupled to secondary winding conductors, configured in a series and parallel topology, along with voltage and current splitters, to ensure synchronized amplitude and phase of input signals, thereby achieving balanced impedance and enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional on-chip transformer power splitters are used in silicon technology, then device integration is achieved, but capacitive coupling degrades power combining and splitting efficiency
Solution Approach 1:
The transformer windings are segmented into series-connected and parallel-connected configurations. The primary windings are divided into multiple segments connected in series, while secondary windings are segmented and connected in parallel, creating distinct electrical paths that reduce capacitive coupling interference and improve power combining efficiency
Solution Approach 2:
The patent transitions from conventional planar transformer designs to a three-dimensional stacked configuration where primary and secondary windings are positioned on different layers. This vertical arrangement reduces parasitic capacitive coupling while maintaining magnetic coupling efficiency, resolving the trade-off between integration and performance
2Power
If conventional transformer designs are used, then transformer coupling is achieved, but system stability deteriorates due to negative impedance
Solution Approach 1:
The patent employs asymmetric winding configurations where primary windings are connected in series and secondary windings in parallel, creating different impedance characteristics that prevent negative impedance conditions. This asymmetric topology ensures stable operation by eliminating the symmetry-induced capacitive coupling that causes instability
Solution Approach 2:
The patent introduces intermediate coupling elements and isolation structures between primary and secondary windings. These intermediary components mediate the magnetic coupling while blocking harmful capacitive coupling paths, maintaining stable system operation even at high frequencies
3Manufacturing precision
If deep-scaled technology is used for on-chip transformers, then manufacturing precision is improved, but capacitive coupling increases causing impedance imbalance
Solution Approach 1:
The patent moves from two-dimensional planar windings to three-dimensional stacked windings on different metal layers. This vertical separation in the third dimension dramatically reduces parasitic capacitive coupling while maintaining the benefits of deep-scaled manufacturing precision, achieving both small size and impedance balance
Solution Approach 2:
The patent applies different connection topologies to different parts of the transformer: series connection for primary windings in regions requiring high voltage handling, and parallel connection for secondary windings in regions requiring current handling. This localized optimization maintains impedance balance across the entire device
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 achieves high transformer coupling efficiency and power combining/splitting efficiency, stabilizing the system and optimizing load impedance, independent of transformer design for various frequency bands, including mmWave applications.
Implementation Method 1
primary winding conductors magnetically coupled to secondary winding conductors
Data Source
AI summary
A transformer power splitter has a plurality of output ports and an input port. The transformer power splitter includes a plurality of primary winding conductors and a plurality of secondary winding conductors. The secondary winding conductors are electrically connected to the output ports respectively. Each of the secondary winding conductors is electrically connected between a positive terminal and a negative terminal of a corresponding output port. The primary winding conductors are magnetically coupled to the secondary winding conductors respectively. The primary winding conductors are configured in a topology including series and parallel connections between a positive terminal and a negative terminal of the input port.