Split-Output LNA Circuit for Multi-Band Impedance Matching
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Solution Overview
Problem
Current high-frequency low-noise amplifiers lack effective solutions for advanced communication requirements, such as carrier aggregation, which demands operation in multiple operation modes and frequency bands, due to the inability to efficiently handle complex signal processing and impedance matching.
Innovation Solution
A semiconductor device with a cascode high-frequency LNA and a splitter on an SOI substrate, utilizing spiral inductors and MOSFETs, that branches and impedance-converts signals, allowing for output switching and impedance matching across multiple frequency bands, enabling operation in single and split modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional high-frequency LNA is used, then simple signal amplification is achieved, but it cannot handle complex signal processing and impedance matching for advanced communication modes
Solution Approach 1:
The LNA is divided into multiple independent amplifier circuits (first LNA, second LNA, etc.), each optimized for specific frequency bands. This segmentation allows each circuit to handle specific signal processing tasks while maintaining overall system versatility for advanced communication modes.
Solution Approach 2:
The LNA system is designed with multiple amplifier circuits that can operate in different configurations (single-mode, split-mode, simultaneous reception mode). The same hardware infrastructure supports multiple operation modes and frequency bands, achieving universality without proportionally increasing complexity.
2Adaptability or versatility
If multiple amplifier circuits are added to support multiple frequency bands, then adaptability for advanced communication is improved, but device complexity increases
Solution Approach 1:
Multiple amplifier circuits are merged into a single integrated LNA system on the SOI substrate. The amplifier circuits share common components such as impedance matching networks and output terminals, reducing overall device complexity while maintaining support for multiple frequency bands.
Solution Approach 2:
The LNA system employs switching mechanisms that dynamically configure the amplifier circuits based on the required operation mode and frequency band. This dynamic reconfiguration allows the same hardware to adapt to different communication requirements without permanent complex interconnections.
3Manufacturing precision
If impedance matching networks are optimized for specific frequency bands, then signal amplification quality is improved, but the device cannot operate efficiently across multiple frequency bands
Solution Approach 1:
Each amplifier circuit is equipped with impedance matching networks optimized for its specific frequency band. The first LNA has matching networks tailored for its frequency range, while the second LNA has different matching networks for its frequency range. This local optimization ensures high precision impedance matching for each band while maintaining overall multi-band capability.
Data Source
AI summary
An amplifier amplifies an input signal. A splitter branches an output signal of the amplifier into a first signal path and a second signal path and performs impedance conversion of the first and second signal paths. A first output terminal outputs the output signal of the amplifier or a signal obtained by branching the output signal of the amplifier into the first signal path by the splitter. A second output terminal outputs the output signal of the amplifier or a signal obtained by branching the output signal of the amplifier into the second signal path by the splitter. An output controller switches whether the output signal of the amplifier is output from the first output terminal, is output from the second output terminal, or is branched by the splitter to be output from both the first and second output terminals.