RF Power Amplifier Calibration for Power Error Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless devices face issues with power error accuracy due to chip-to-chip variation and temperature fluctuations, leading to failures in meeting power error accuracy specifications during production.
Innovation Solution
A method to identify unique permutations of the initial PA parameter set by generating candidate PA parameter sets, adjusting parameters, and selecting a final PA parameter set that meets a predetermined power error accuracy threshold, thereby improving power error accuracy and increasing yield rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If curve fitting method is used to determine PA parameter set, then manufacturing process is simple, but power error accuracy does not meet specification
Solution Approach 1:
The patent applies preliminary action by pre-calibrating PA parameters during manufacturing using a comprehensive calibration process that generates lookup tables. These pre-calibrated parameters and lookup tables are stored in memory for use during operation, eliminating the need for complex real-time calculations and ensuring power error accuracy meets specifications from the start.
Solution Approach 2:
The patent skips the complex iterative optimization process by using a direct calibration approach with lookup tables. Instead of performing complex real-time parameter optimization during operation, the system pre-computes optimal parameters across the full range of operating conditions and stores them for direct retrieval, significantly simplifying the manufacturing process while maintaining accuracy.
2Manufacturing precision
If PA parameters are calibrated for target output power, then power level accuracy is improved, but power error accuracy fails to meet specification
Solution Approach 1:
The patent performs preliminary calibration across all operating conditions during manufacturing, generating comprehensive lookup tables that contain pre-optimized parameters for various power levels and temperature conditions. This preliminary action ensures power error accuracy meets specifications without requiring time-consuming real-time calibration during operation.
Solution Approach 2:
The patent implements dynamic calibration by creating lookup tables that account for varying operating conditions including different power levels and temperature ranges. The system dynamically selects appropriate calibrated parameters from the lookup tables based on current operating conditions, ensuring accuracy across the full operational envelope without requiring repeated calibration.
3Productivity
If yield rate is increased by relaxing error threshold, then productivity improves, but power error accuracy specification is not met
Solution Approach 1:
The patent changes the calibration parameters by optimizing PA parameters across multiple operating points and storing them in lookup tables. This parameter optimization ensures that power error accuracy meets specifications while maintaining high yield rate, as the pre-calibrated parameters compensate for manufacturing variations without requiring strict threshold enforcement.
Solution Approach 2:
The patent incorporates feedback by measuring actual power output during calibration and using this information to adjust and optimize PA parameters. The calibration process uses measured power errors to refine the lookup tables, ensuring that final parameters meet power error accuracy specifications while maximizing yield rate.
Data Source
AI summary
Implementations disclosed describe techniques and systems for calibrating parameters of a radio frequency power amplifier. The disclosed techniques include, among other things, identifying an initial power amplifier (PA) parameter set of a radio frequency (RF) module. A plurality of candidate PA parameter sets is generated. A set of error values for each of the plurality of candidate PA parameter sets is determined. A subset of the plurality of candidate PA parameter sets is identified. Each error value of the set of error values of each candidate parameter set in the subset satisfies an error threshold. A final PA parameter set is stored.