Transformer Inductor Coupling Tuning for Wider High-Frequency Bandwidth
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Solution Overview
Problem
High-frequency applications, such as 5G, face limitations in circuit bandwidth due to the steep slope of the K-curve in coupled inductors, which is exacerbated by increasing electrical coupling, impacting impedance transformation and circuit performance.
Innovation Solution
Incorporating cross-coupled capacitor circuits that allow for adjustable capacitance values to balance and tune the electrical coupling between inductors, thereby flattening the K-curve and maintaining magnetic coupling constant, allowing for adjustable coupling coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical coupling between inductors is increased, then coupling coefficient is improved, but K-curve slope becomes steeper and circuit bandwidth is limited
Solution Approach 1:
The patent introduces capacitor circuits connected between the primary and secondary windings to modify the electrical coupling parameters. By adjusting the capacitance values in these circuits, the overall coupling coefficient can be optimized while simultaneously flattening the K-curve slope, thereby resolving the contradiction between achieving high coupling coefficient and maintaining wide bandwidth.
Solution Approach 2:
The capacitor circuits serve as intermediary elements between the inductors, providing a controlled electrical coupling path. These capacitors mediate the interaction between windings, allowing independent optimization of coupling strength and frequency response characteristics, thus enabling both high coupling coefficient and flat K-curve.
2Speed
If frequency is increased for high frequency applications, then operating speed is improved, but K-curve slope increases and impacts impedance transformation
Solution Approach 1:
The capacitor circuits are designed with specific capacitance values that compensate for the frequency-dependent behavior of the transformer. By carefully selecting these parameters, the patent achieves stable impedance transformation ratio across wide frequency ranges, enabling high-frequency operation while maintaining precise impedance control.
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 mitigates the steep slope of the K-curve, enhancing circuit bandwidth and impedance transformation by adjusting the electrical coupling, thereby improving the performance of high-frequency applications.
Implementation Method 1
a coupling coefficient K (e.g., total coupling) of the design can include a magnetic coupling Km and an electrical coupling Ke
Implementation Method 2
two inductors coupled to one another via electric fields and magnetic fields
Data Source
AI summary
The present disclosure describes a circuit that includes a first inductor having a first terminal and second terminal, a second inductor having a third terminal and a fourth terminal, a first capacitor circuit, and a second capacitor circuit. The first and third terminals have a same polarity. The first capacitor circuit is cross-coupled to the first terminal and the fourth terminal. The second capacitor circuit is cross-coupled to the second terminal and the third terminal. The first and second capacitor circuits adjust an electrical coupling between the first and second inductor.