RF Front-End Switching Between Dual LNAs Across Overlapping Bands
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Solution Overview
Problem
As communication bands expand to wider and higher frequency ranges, existing radio-frequency front-end circuits face challenges in maintaining high amplification performance, leading to deteriorated gain and increased power consumption and signal distortion for single low-noise amplifiers handling multiple bands.
Innovation Solution
A radio-frequency circuit design featuring two low-noise amplifiers and a switch configuration, where one amplifier handles a broader frequency band and the other a narrower band within the inclusion relation, ensuring high amplification performance, low power consumption, and reduced signal distortion by dividing the amplification tasks between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single low-noise amplifier is used to amplify multiple communication bands, then the device complexity is reduced, but the amplification performance deteriorates with increased power consumption and signal distortion
Solution Approach 1:
The patent divides the amplification function into multiple low-noise amplifiers, each dedicated to specific communication bands. This segmentation allows each amplifier to be optimized for its designated frequency range, maintaining high amplification performance while managing device complexity through functional division.
2Device complexity
If a single low-noise amplifier handles extensive bandwidth and frequency bands, then the device complexity is reduced, but power consumption increases
Solution Approach 1:
By segmenting the amplification task across multiple low-noise amplifiers, each amplifier operates within an optimized frequency range, reducing the overall power consumption compared to a single amplifier attempting to cover the entire bandwidth.
Solution Approach 2:
The patent employs switching mechanisms that dynamically connect different low-noise amplifiers based on the active communication band, ensuring that only the necessary amplifiers are powered and operational at any given time, thereby optimizing power consumption.
3Device complexity
If a single low-noise amplifier covers extensive frequency bands, then the device complexity is reduced, but signal distortion increases
Solution Approach 1:
The patent segments the frequency coverage among multiple low-noise amplifiers, with each amplifier optimized for specific bands. This prevents the signal distortion that would occur in a single amplifier attempting to cover all bands, as each amplifier operates within its optimal performance range.
Data Source
AI summary
A radio-frequency circuit includes a first switch which includes a common terminal, a first selection terminal, and a second selection terminal, and switches between connecting the common terminal and the first selection terminal and connecting the common terminal and the second selection terminal; a first low-noise amplifier including an input terminal connected to the first selection terminal, and a second low-noise amplifier including an input terminal connected to the second selection terminal. The frequency band in which the first low-noise amplifier amplifies a radio-frequency signal by at least a predetermined gain includes the frequency band in which the second low-noise amplifier amplifies a radio-frequency signal by at least a predetermined gain.