Dual-Antenna LNA Control for Radiation Spurious Emission
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Solution Overview
Problem
Antenna radiation performance is deteriorated due to signal distortion caused by obstacles, leading to radiation spurious emission (RSE) when signals are induced to another antenna within the electronic device.
Innovation Solution
An electronic device is equipped with a sensor unit to detect the closed state of a folder part, controlling the low noise amplifier (LNA) in a second antenna to be turned off temporarily when a predetermined condition is met, thereby preventing signal induction and amplification in the second antenna during transmission through a first antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LNA is always on to ensure signal reception, then signal reception sensitivity is improved, but RSE increases due to amplification of induced signals
Solution Approach 1:
The LNA is controlled to dynamically change its operating state between on and off based on the detected state of the folder part. When the folder part is in the closed state, the LNA is turned off to prevent RSE. When the folder part is in the open state, the LNA is turned on to ensure signal reception sensitivity. This dynamic control resolves the contradiction by adapting the LNA's operation to the actual operational context.
Solution Approach 2:
The operating parameter of the LNA (power state) is changed based on the state of the folder part. By detecting whether the folder part is closed or open, the system changes the LNA's power consumption state and amplification function accordingly, thereby controlling RSE while maintaining reception sensitivity when needed.
2Use of energy by moving object
If the LNA is turned off to reduce power consumption and RSE, then power efficiency is improved, but signal reception capability is degraded
Solution Approach 1:
The LNA's power state is dynamically adjusted based on the folder part's state. During transmission when the folder part is closed, the LNA is turned off to save power and reduce RSE. During reception when the folder part is open, the LNA is turned on to ensure signal reception capability. This dynamic adaptation resolves the contradiction between power consumption and reception capability.
Solution Approach 2:
The LNA is periodically switched between on and off states based on the operational mode (transmission vs. reception) and the state of the folder part. This periodic control ensures that the LNA consumes power only when necessary for signal reception, while remaining off during transmission to reduce power consumption and RSE.
3Reliability
If the LNA amplifies all received signals, then weak signals are enhanced, but induced signals from obstacles cause RSE
Solution Approach 1:
The system takes preliminary action by detecting the state of the folder part before signal amplification occurs. When the folder part is in the closed state, the system preemptively turns off the LNA to prevent amplification of induced signals that would cause RSE. This preliminary anti-action prevents the harmful effect before it can occur.
Solution Approach 2:
The amplification parameter of the LNA is changed based on the folder part's state. When the folder part is closed, the LNA's amplification function is disabled to prevent distortion of induced signals. When the folder part is open, the LNA's amplification parameter is activated to enhance weak signals. This parameter change resolves the contradiction between weak signal enhancement and prevention of signal distortion.
Data Source
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AI summary
The present invention relates to an electronic device and a method for controlling an amplifier on the basis of the state of the electronic device. According to various embodiments of the present invention, the electronic device comprises: a first antenna for transmitting and receiving a wireless signal; a second antenna for receiving the wireless signal and including a low noise amplifier (LNA) for amplifying the received wireless signal; and a processor electrically connected to the first antenna and the second antenna. The processor can be configured to control the LNA of the second antenna to be at least temporarily turned off during transmission of the wireless signal through the first antenna when the electronic device is in a first state. Various embodiments other than the various embodiments disclosed in the present invention are possible.