High-Frequency Amplifier Switching Across Wide 5G Bands
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Solution Overview
Problem
High frequency amplifier circuits face challenges in maintaining good amplification characteristics across wide communication bands, particularly in 5G communication standards like n77, due to limitations in dynamic range and frequency band coverage.
Innovation Solution
A high frequency amplifier circuit design that includes two amplifiers with different frequency characteristics connected in parallel, along with a switch circuit and filters, allowing exclusive switching between them to ensure amplification across a wide communication band, thereby maintaining consistent gain characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one amplifier is used to cover the entire wide communication band, then device complexity is reduced, but amplification characteristics deteriorate in certain frequency ranges
Solution Approach 1:
The wide communication band is divided into multiple frequency bands, with each amplifier (first amplifier for first frequency band, second amplifier for second frequency band) optimized to cover a specific segment. The switch circuit selectively connects the appropriate amplifier based on the input signal frequency, ensuring optimal amplification characteristics across the entire wide band while maintaining manageable device complexity.
2Reliability
If multiple amplifiers are used to maintain good amplification characteristics across the entire communication band, then amplification characteristics are improved, but device complexity increases
Solution Approach 1:
The system dynamically switches between the first amplifier and the second amplifier based on the frequency of the input signal. The switch circuit responds to frequency changes by selectively connecting the appropriate amplifier, allowing the system to adapt its configuration in real-time to maintain optimal amplification characteristics across the wide communication band without permanently requiring all amplifiers to be active simultaneously.
3Adaptability or versatility
If amplifiers with different frequency characteristics are used, then coverage of wide communication band is improved, but consistency of gain characteristics worsens
Solution Approach 1:
Each amplifier is designed with specific frequency characteristics optimized for its designated frequency band. The first amplifier has gain characteristics optimized for the first frequency band, while the second amplifier has gain characteristics optimized for the second frequency band. This local optimization ensures that each amplifier performs excellently in its specific range, and the switch circuit ensures the appropriate amplifier is selected for each frequency, maintaining overall consistency across the wide band.
Data Source
AI summary
A high frequency amplifier circuit includes an input terminal and an output terminal, transmission power amplifiers that amplify a high frequency signal in first and second frequency bands, each of which is a part of a communication band, at equal to or higher than a prescribed amplification factor, respectively, switches that exclusively switch connection between the input terminal, the transmission power amplifier, and the output terminal, and connection between the input terminal, the transmission power amplifier, and the output terminal, and a transmission filter that is connected between the output terminal and the switch and has a communication band as a pass band, the first frequency band including a frequency band other than the second frequency band, the second frequency band including a frequency band other than the first frequency band.