Split-Combine Power Amplifier Transformer Layout for High-Frequency Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power amplifier transformers face challenges in maintaining high quality factor and coefficient of coupling at high operating frequencies due to large parasitic capacitances and excessive routing, leading to degraded output power and efficiency.
Innovation Solution
A split and combine transformer design with angled secondary windings and a 1:1 turn ratio, featuring parallel connections of secondary windings to minimize routing and parasitic inductance, while using a central axis to bisect transformer outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional transformer designs are used with standard winding configurations, then the transformer can be easily manufactured, but parasitic inductance increases and coupling coefficient decreases at high frequencies
Solution Approach 1:
The patent applies asymmetry by positioning the secondary windings at angled orientations relative to the central axis rather than in symmetric configurations. Specifically, secondary windings are arranged at angles (e.g., 45 degrees) to minimize parasitic inductance and maximize coupling coefficients at high operating frequencies, deviating from traditional symmetric winding layouts.
Solution Approach 2:
The patent transitions from planar two-dimensional winding arrangements to three-dimensional spatial configurations by angling secondary windings in three-dimensional space relative to the central axis. This dimensional change allows optimization of electromagnetic coupling and parasitic inductance characteristics that cannot be achieved with flat, two-dimensional winding patterns.
2Loss of energy
If excessive routing is used to connect transformer components, then connectivity is achieved, but parasitic capacitance increases and efficiency decreases
Solution Approach 1:
The patent extracts and eliminates excessive routing by directly connecting secondary windings in parallel configuration with minimal interconnection paths. The design removes unnecessary routing segments that would introduce parasitic capacitance, keeping only the essential connections required for parallel winding configuration and output signal extraction.
Solution Approach 2:
The patent merges the secondary windings into a parallel configuration where multiple secondary windings are connected in parallel to each other, combining their outputs directly. This merging approach reduces the number of separate routing paths needed and minimizes parasitic capacitance by consolidating connections through the central axis.
3Power
If large parasitic capacitances are present in the transformer, then manufacturing is simplified, but output power and efficiency degrade at high frequencies
Solution Approach 1:
The asymmetric angular positioning of secondary windings relative to the central axis creates optimized electromagnetic field distributions that minimize parasitic capacitance effects. The non-symmetric angles (e.g., 45-degree orientations) reduce capacitive coupling between adjacent winding segments while maintaining inductive coupling, thereby reducing overall parasitic capacitance.
Solution Approach 2:
The patent changes the geometric parameters of the winding configuration by introducing specific angular orientations and spatial arrangements. These parameter changes (angles, positions, and three-dimensional configurations) directly affect the electromagnetic characteristics, reducing parasitic capacitance and optimizing performance at high operating frequencies.
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 proposed transformer design enhances efficiency and output power by reducing parasitic inductance and maintaining high coupling coefficients, improving power amplifier performance at high frequencies.
Implementation Method 1
a first transformer winding includes a first proximal end and a first distal end. The example apparatus includes a second transformer winding. The second transformer winding includes a second proximal end and a second distal end
Data Source
AI summary
An example apparatus includes a first transformer winding having a first proximal end and a first distal end and a second transformer winding having a second proximal end and a second distal end, the first proximal end having a first distance from the second proximal end and the first distal end having a second distance from the second distal end, the first distance less than the second distance.