Feedback Receiver Control of Power Amplifier Spurious Emissions
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Solution Overview
Problem
Electronic devices face challenges in real-time detection and control of spurious emissions, which can interfere with other devices or systems, as they typically require external measurement tools and lack self-determination and control capabilities.
Innovation Solution
An electronic device with a processor and memory that sets time intervals for spurious emission detection modes, analyzes feedback signals using varying resolution bandwidths to identify and control spurious emissions, and adjusts power amplifier biasing to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external measurement tools are used to detect spurious emissions, then measurement accuracy is improved, but device complexity and real-time control capability deteriorate
Solution Approach 1:
The electronic device performs self-diagnosis by using its own feedback receiver to detect spurious emissions from its power amplifier, eliminating the need for external measurement tools. The processor analyzes feedback signals containing spurious emission information and automatically adjusts power amplifier bias voltage to control emissions,实现ing autonomous detection and control without external equipment.
Solution Approach 2:
The system uses a feedback receiver to capture feedback signals containing spurious emission information from the power amplifier output. The processor analyzes these feedback signals to determine spurious emission presence and uses the information to adjust power amplifier bias voltage, creating a closed-loop control system that continuously monitors and corrects emissions in real-time.
2Object-generated harmful factors
If real-time spurious emission detection is implemented, then interference control is improved, but device complexity and power consumption increase
Solution Approach 1:
The feedback receiver, originally designed for general power amplifier feedback, is made multi-functional by configuring it to operate in spurious emission detection mode. The same hardware infrastructure serves both traditional power control and spurious emission detection, avoiding the need for separate dedicated detection equipment and reducing overall system complexity.
Solution Approach 2:
The feedback receiver operates with different resolution bandwidths (first resolution bandwidth for initial detection, second narrower resolution bandwidth for confirmation) to optimize detection sensitivity. The processor adjusts operational parameters such as time intervals for detection mode and bias voltage levels to balance real-time detection capability with power consumption and system complexity.
3Measurement precision
If narrow resolution bandwidth is used for spurious emission detection, then measurement precision is improved, but detection time increases
Solution Approach 1:
The detection process is divided into two stages: initial screening using a first resolution bandwidth to quickly identify potential spurious emissions, followed by confirmation using a second, narrower resolution bandwidth only for frequencies where emissions were initially detected. This segmented approach reduces overall detection time while maintaining precision for actual emissions.
Solution Approach 2:
The system performs preliminary detection using a wider first resolution bandwidth before applying the narrower second resolution bandwidth. This preliminary action identifies candidate frequencies that require detailed analysis, preventing the system from unnecessarily using narrow bandwidth across the entire frequency spectrum and thus reducing total detection time.
Data Source
AI summary
Disclosed are an electronic device and a method of controlling a spurious emission. A spurious emission is identified by setting a first time interval in which a feedback receiver operates in a spurious emission detection mode, and identifying a spurious emission from the electronic device by analyzing a feedback signal obtained by the feedback receiver based on a first resolution bandwidth and a second resolution bandwidth in the first time interval.