Balun-Coupled Power Amplifier for Low-Frequency Distortion Suppression
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Solution Overview
Problem
In differential amplification-type power amplifier circuits, frequency components lower than the high-frequency signal can be superimposed on the output signal due to distortion components, particularly in the context of fifth-generation mobile communication systems where power efficiency is a concern.
Innovation Solution
A power amplifier circuit configuration that includes a balun transformer with an input-side winding connected to the differential outputs of the differential amplifier circuit and an output-side winding coupled via an electromagnetic field, with a capacitive element between the output-side winding and the output node, effectively preventing lower-frequency components from being superimposed on the output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a differential amplifier circuit is used to amplify high-frequency signals, then amplification performance is improved, but lower-frequency distortion components are superimposed on the output signal
Solution Approach 1:
A capacitive element is introduced as an intermediary component between the differential amplifier circuit and the output node. This capacitor blocks lower-frequency distortion components while allowing high-frequency signals to pass through, effectively separating the useful signal from harmful distortion without affecting the amplification performance of the differential amplifier circuit.
2Adaptability or versatility
If multiple frequency bands and wider bandwidths are supported, then communication capability is improved, but power consumption increases
Solution Approach 1:
The capacitive element enables the power amplifier circuit to efficiently operate across multiple frequency bands by filtering out distortion components that would otherwise require additional complex circuitry. This parameter optimization allows the circuit to maintain high efficiency while supporting multiple frequency bands and wider bandwidths, thereby reducing overall power consumption.
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 effectively suppresses the superimposition of lower-frequency distortion components on the output signal, enhancing the power amplifier's efficiency and performance in supporting multiple frequency bands and wider bandwidths.
Implementation Method 1
an output-side winding that is coupled to the input-side winding via an electromagnetic field
Data Source
AI summary
A power amplifier circuit has an input node from which an input signal, which is a high-frequency signal, is inputted and an output node to which the input signal is amplified by a differential amplifier circuit to be outputted as an output signal. The power amplifier circuit includes a balun transformer (second balun transformer) including an input-side winding that has a substantially center to which a power-supply voltage is supplied and that is connected between differential outputs of the differential amplifier circuit, and an output-side winding that is coupled to the input-side winding via an electromagnetic field and that has one end connected to a reference potential; and a capacitive element (capacitor) provided between another end (node) of the output-side winding and the output node.