PA Drain Voltage Control Using Link Status Feedback
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Solution Overview
Problem
The power consumption of power amplifiers (PAs) in radio frequency modules is high due to fixed drain voltage settings, even when maximum transmit power is not required, leading to inefficiency and increased emissions, especially with individual component variations across batches.
Innovation Solution
A method and device that dynamically adjust the drain voltage of PAs based on real-time link status indications, such as MSE, EVM, or SNR, to reduce power consumption while ensuring communication system reliability, by decreasing the voltage when link quality is good and increasing it when poor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drain voltage of the PA is kept at a maximum value to ensure reliability, then the system reliability is improved, but the power consumption of the PA increases
Solution Approach 1:
The patent applies dynamics by transitioning from a static drain voltage setting to a dynamic one. The drain voltage is adjusted in real-time based on link status feedback (such as EVM or SNR measurements), allowing the system to optimize power consumption while maintaining reliability. When link quality is good, the drain voltage is reduced to save power; when link quality degrades, the voltage is increased to ensure reliable communication.
Solution Approach 2:
The patent implements feedback control by continuously monitoring link status parameters (EVM, SNR, or other quality metrics) and using this information to adjust the drain voltage of the PA. The feedback loop enables the system to respond to changing channel conditions and component variations, optimizing the trade-off between power consumption and reliability based on actual system performance.
2Use of energy by moving object
If the drain voltage is reduced to decrease power consumption, then the power consumption of the PA is reduced, but the system reliability may deteriorate
Solution Approach 1:
Feedback control is used to monitor link status parameters and adjust the drain voltage accordingly. The system only reduces voltage when link quality metrics (EVM, SNR) indicate that the connection is robust, and increases voltage when quality degrades, thus maintaining reliability while optimizing power consumption.
Solution Approach 2:
The system dynamically adjusts the drain voltage based on real-time link conditions rather than using a fixed setting. This dynamic adaptation allows the system to operate at lower power when conditions permit while automatically increasing power when reliability is at risk, resolving the contradiction between power savings and reliability.
3Device complexity
If fixed drain voltage settings are used to simplify design, then the device complexity is reduced, but the power consumption efficiency deteriorates
Solution Approach 1:
The patent introduces feedback-based automatic adjustment of drain voltage, eliminating the need for complex manual design calculations and component matching. The system self-optimizes by monitoring link status and adjusting voltage accordingly, reducing design complexity while significantly improving power efficiency compared to fixed voltage approaches.
Solution Approach 2:
The system performs self-optimization by automatically adjusting its own drain voltage based on monitored link conditions. This self-service capability eliminates the need for complex external calibration and design adjustments, allowing the system to adapt to component variations and channel conditions autonomously while improving power efficiency.
Data Source
AI summary
Embodiments of the present invention disclose a method and a device for reducing power consumption of a PA, and relate to the field of communications technologies, which can reduce the power consumption of the PA to a maximum extent for components of different batches. A detailed solution is as follows: The station A receives a first link status indication sent by a station B, where the first link status indication includes a parameter of a status of a link from the station A to the station B; and if the parameter included in the first link status indication is greater than a first threshold, the station A decreases a drain voltage of the PA, to reduce the power consumption of the PA. The embodiments of the present invention are applied to a process of communication between point-to-point radio frequency modules.