Post-Distortion Amplifier Circuit for 5G Linearity Control
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Solution Overview
Problem
5G communication systems face challenges in maintaining amplification efficiency while improving linearity, particularly due to nonlinear components generated during signal amplification, which affect the output and reduce the amplifier's performance.
Innovation Solution
The proposed amplifier structure includes a first transistor for amplifying the fundamental signal and a second transistor with its source terminal connected to the drain terminal of the first transistor and a drain terminal connected to a bias voltage, where the current through the second transistor is determined based on the current flowing in the drain terminal of the first transistor, allowing for the minimization of intermodulation components and improvement of linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal amplification is performed using conventional amplifier structures, then amplification efficiency is achieved, but nonlinear components are generated that reduce linearity
Solution Approach 1:
The patent converts the harmful nonlinear components generated by the first transistor into a useful signal by feeding them back through the second transistor. The second transistor amplifies these nonlinear components and feeds them back to cancel out the distortion, transforming the harmful distortion into a beneficial linearity-improving mechanism
Solution Approach 2:
The patent implements a feedback mechanism where the output signal containing nonlinear components is fed back through the second transistor to the input. This feedback loop continuously compensates for distortion by injecting corrected signals that cancel out the nonlinear components, thereby improving overall linearity
2Reliability
If amplifier structures are modified to improve linearity, then linearity increases, but device complexity increases
Solution Approach 1:
The patent divides the amplifier into two distinct transistor stages with different functions. The first transistor handles primary signal amplification while the second transistor handles distortion compensation. This segmentation allows each component to be optimized for its specific function, achieving improved linearity through a relatively simple divided structure rather than a complex monolithic design
Data Source
AI summary
A communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT) are provided. The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. An amplifier includes a first transistor for amplifying the fundamental signal applied to a gate terminal, and a second transistor having a source terminal electrically connected to the drain terminal of the first transistor and a drain terminal electrically connected to a bias voltage. The current flowing through the second transistor may be determined based on the current flowing in the drain terminal of the first transistor.