Multi-Band LNA Impedance Switching for Smaller RF Modules
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Solution Overview
Problem
Conventional radio frequency modules suffer from inefficient utilization of low-noise amplifiers (LNAs) due to their inability to cover multiple frequency bands, leading to idle LNAs in certain scenarios and increased module size, which is problematic for small-sized electronic devices.
Innovation Solution
The implementation of impedance adjustment networks in LNAs allows them to switch between different impedance states, enabling them to match various frequency bands, thereby increasing the utilization of LNAs and reducing the number required, thus optimizing chip area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate LNAs are used for different frequency bands to ensure full coverage, then frequency band coverage is improved, but the quantity of LNAs increases and chip area increases
Solution Approach 1:
The patent applies universality by designing a single LNA that can function across multiple frequency bands (low band and middle/high band) through impedance adjustment. The LNA is configured to operate in different impedance states, allowing one component to replace what would traditionally require multiple separate LNAs, thereby reducing chip area while maintaining full frequency coverage.
Solution Approach 2:
The patent applies dynamics by implementing an impedance adjustment network that can dynamically switch the LNA between different impedance states. This dynamic adjustment enables the LNA to adapt its input and output impedance to match different frequency bands, allowing a single LNA to cover multiple bands that would otherwise require separate static LNAs.
2Adaptability or versatility
If separate LNAs are used for different frequency bands to ensure full coverage, then frequency band coverage is improved, but the quantity of LNAs increases
Solution Approach 1:
The patent applies universality by designing a single LNA that can function across multiple frequency bands (low band and middle/high band) through impedance adjustment. The LNA is configured to operate in different impedance states, allowing one component to replace what would traditionally require multiple separate LNAs, thereby reducing chip area while maintaining full frequency coverage.
3Productivity
If impedance adjustment network is added to enable multi-band operation, then LNA utilization is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the impedance parameters of the LNA through the impedance adjustment network. By changing the impedance state of the LNA, the system can operate across different frequency bands without requiring multiple separate LNAs. This parameter-based approach improves LNA utilization while keeping the structural complexity relatively low compared to adding multiple complete LNA circuits.
Data Source
AI summary
A radio frequency module, a low-noise amplifier, and an electronic device. The radio frequency module includes: N first low-noise amplifiers coupled between a signal input port and a signal output port, where an input impedance and an output impedance of the first low-noise amplifier match a first frequency band; and M second low-noise amplifiers coupled between the signal input port and the signal output port, where the second low-noise amplifier includes an impedance adjustment network, and the impedance adjustment network can adjust an input impedance and an output impedance of the second low-noise amplifier, so that the input impedance and the output impedance of the second low-noise amplifier match different frequency bands. In this way, the second low-noise amplifier can be reused between different frequency bands such as an LB band and an MHB band, thereby increasing utilization of the low-noise amplifier.