Multi-Antenna Beamforming PA Control for EIRP and EVM Stability
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Solution Overview
Problem
In electronic devices using multiple antennas for high-frequency band communication, the equivalent isotropic radiated power (EIRP) deteriorates due to heat-generated amplification performance variations among power amplifiers, leading to a trade-off with error vector magnitude (EVM) degradation, as increasing input values to compensate for EIRP loss can cause power amplifiers to operate in saturation regions.
Innovation Solution
The electronic device employs a processor to individually control power amplifiers by connecting attenuators to reduce input values when performance deterioration is detected, using variable resistors to maintain EIRP while reducing EVM degradation, and includes sensors to adjust input values based on device state changes such as folding or extending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the input value of power amplifiers is increased to compensate for EIRP deterioration, then EIRP is improved, but EVM deteriorates due to saturation region operation
Solution Approach 1:
The patent divides the control of multiple power amplifiers into individual segments, where each power amplifier is controlled independently based on its own temperature characteristics and performance state. This allows selective adjustment of input values for each amplifier rather than uniformly increasing all, preventing saturation in individual amplifiers while maintaining overall EIRP.
Solution Approach 2:
The system dynamically adjusts the input values of power amplifiers based on real-time temperature measurements and performance monitoring. As temperature changes affect amplifier characteristics, the control unit modifies input values adaptively to maintain optimal operation in the linear region, preventing EVM degradation while compensating for EIRP variations.
2Power
If the common input value of power amplifiers is increased to maintain transmission performance, then EIRP is maintained, but amplification performance deteriorates due to heat generation
Solution Approach 1:
The system implements temperature feedback monitoring for each power amplifier, where temperature sensors provide real-time thermal state information to the control unit. Based on this feedback, the control unit adjusts input values to prevent excessive heat generation and performance deterioration, maintaining transmission performance within safe thermal operating limits.
Solution Approach 2:
The patent changes the operating parameters (input values) of power amplifiers based on their temperature states. When temperature increases cause performance deterioration, the system modifies input parameters adaptively to maintain optimal amplification without excessive heat generation, balancing transmission performance and thermal management.
3Reliability
If individual control of power amplifiers is implemented to prevent saturation, then EVM is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies local quality control by monitoring and adjusting each power amplifier individually based on its specific temperature characteristics and operational state. Each amplifier receives customized control parameters rather than uniform control, preventing saturation in individual amplifiers and maintaining overall EVM performance without requiring complex centralized control of the entire system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively compensates for EIRP deterioration and reduces EVM by individually managing power amplifiers, ensuring stable communication performance across different device states.
Implementation Method 1
a first attenuator electrically connected to the first antenna; a second attenuator electrically connected to the second antenna
Data Source
AI summary
A method performed by an electronic device, includes: generating a beamforming signal by using a first antenna and a second antenna; increasing a first input value of a first power amplifier and a second input value of a second power amplifier, based on performance of the beamforming signal being deteriorated; measuring a first output value of the first power amplifier based on the increased first input value and measuring a second output value of the second power amplifier based on the increased second input value; and determining, based on the measured first output value and the measured second output value, at least one of the first power amplifier or the second power amplifier is deteriorated in performance, and connecting a first attenuator or a second attenuator electrically to the deteriorated power amplifier.