RF LNA Gain Control During 2TX to Limit 5G RX Desense
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Solution Overview
Problem
In electronic devices supporting 5G communication systems, intermodulation distortion (IMD) occurs during 2TX operations, leading to reception performance degradation, such as desense, due to IMD components affecting downlink bands.
Innovation Solution
The electronic device adjusts the gain of low noise amplifiers (LNAs) included in RFICs and RFFEs based on RF signals across multiple operating bands, specifically setting different gains for uplink and downlink bands during concurrent signal transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electronic device performs 2TX operation to transmit RF signals in multiple operating bands, then data transfer speed is improved, but intermodulation distortion occurs causing reception performance degradation
Solution Approach 1:
The patent dynamically adjusts the gain of low noise amplifiers (LNAs) based on the operating mode (1TX or 2TX). During 2TX operation, the LNA gain is reduced to minimize intermodulation distortion, while during 1TX operation, the LNA gain is increased to maximize signal reception sensitivity. This dynamic adaptation resolves the contradiction between maintaining high data transfer speed and ensuring reliable reception performance.
Solution Approach 2:
The patent changes the gain parameter of the LNA according to the transmission mode. By setting different gain values for 1TX and 2TX operations, the system optimizes reception performance for each mode while maintaining the ability to perform high-speed data transfer through 2TX operation.
2Measurement precision
If the gain of low noise amplifiers is increased to improve signal reception, then reception sensitivity is improved, but intermodulation distortion increases causing desense
Solution Approach 1:
The LNA gain is dynamically controlled based on the transmission mode detected by the communication processor. In 1TX mode, high gain is applied to maximize reception sensitivity. In 2TX mode, the gain is reduced to prevent intermodulation distortion. This dynamic adjustment resolves the contradiction between reception sensitivity and intermodulation distortion.
Solution Approach 2:
The communication processor monitors the transmission mode and provides feedback control to adjust the LNA gain accordingly. This closed-loop control ensures that the LNA operates at optimal gain levels for each mode, preventing excessive intermodulation distortion while maintaining high reception sensitivity when appropriate.
Data Source
AI summary
According to various embodiments, an electronic device may include: a radio frequency integrated circuit (RFIC) including a plurality of first low noise amplifiers (LNAs); at least one radio frequency front end (RFFE) operatively connected to the RFIC; and at least one communication processor operatively connected to the RFIC, wherein the at least one communication processor is configured to: based on a first RF signal within a first uplink band of a first operating band being output via the RFIC, control the RFIC to set, to be a first gain, a gain of at least one first LNA among the plurality of first LNAs configured to process a second RF signal within a first downlink band of the first operating band provided from the at least one RFFE to the RFIC, and based on the first RF signal and a third RF signal within a second uplink band of a second operating band different from the first operating band being at least concurrently output via the RFIC, control the RFIC to set, to be a second gain, the gain of the at least one first LNA configured to process the second RF signal provided from the at least one RFFE to the RFIC, wherein the second gain is less than the first gain.