RF Module Transformer Coupling for Fewer Resonant Circuit Components
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Solution Overview
Problem
Existing semiconductor devices face challenges in improving attenuation characteristics of resonant circuits without increasing the number of components, such as inductors, in the resonant circuit.
Innovation Solution
A radio-frequency module design that incorporates a transformer with a primary and secondary coil, a series-connected inductor, and a capacitor, where the secondary coil and inductor are coupled via magnetic field coupling to form an LC series resonant circuit without additional inductors, reducing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional inductors are added to improve attenuation characteristics of the resonant circuit, then the attenuation performance is improved, but the number of components increases
Solution Approach 1:
The patent combines the function of the resonant circuit inductor with the transformer secondary coil. The secondary coil serves dual purposes: as part of the transformer for signal conversion and as the inductor for the resonant circuit. This merging eliminates the need for a separate inductor component while achieving the desired attenuation characteristics through magnetic field coupling between the secondary coil and the resonant circuit inductor.
2Device complexity
If the number of components is reduced, then device complexity is lowered, but it becomes difficult to achieve effective attenuation characteristics
Solution Approach 1:
The transformer secondary coil is designed to perform multiple functions simultaneously: it acts as both the transformer secondary winding for balanced-to-unbalanced signal conversion and as the inductor element for the resonant circuit. This multi-functionality allows the circuit to achieve effective attenuation characteristics with fewer components, as the same physical structure serves multiple purposes in the overall system.
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 design achieves attenuation poles at specific frequencies, reducing the number of components in the resonant circuit while maintaining effective bandpass characteristics.
Implementation Method 1
the secondary coil and the first inductor are coupled to each other via magnetic field coupling
Data Source
AI summary
A radio-frequency module includes amplifiers and, a transformer including a primary coil and a secondary coil, an antenna connection terminal, an inductor disposed in series between one end of the secondary coil and the antenna connection terminal, and a capacitor connected between a path connecting the one end of the secondary coil and the inductor and a ground. One end of the primary coil is connected to an output end of the amplifier, another end of the primary coil is connected to an output end of the amplifier, another end of the secondary coil is connected to the ground, and the secondary coil and the inductor are coupled to each other via magnetic field coupling.