RF Power Amplifier Calibration via Linear Interpolation
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Solution Overview
Problem
Conventional methods for calibrating RF power amplifiers in communication devices require calibration for all output powers across multiple power modes, leading to increased calibration time and unnecessary storage of gain tables and input power values, especially when using average power tracking technology.
Innovation Solution
An electronic device with a power amplifier, RF transmission circuit, processor, and memory that stores data points for input and output power relationships, allowing the processor to select and control output power by interpolating between data points to determine required input power for RF signal transmission, thereby reducing calibration time and storage needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed for all output powers across multiple power modes, then the power amplifier characteristics are accurately calibrated, but calibration time increases and unnecessary gain tables and input power values must be stored
Solution Approach 1:
The patent extracts only the necessary calibration data points (first data point with first input power, second data point with second input power) from the complete set of all possible output powers. By storing only these essential data points and using linear interpolation to generate intermediate values, the system achieves accurate calibration without the time-consuming process of calibrating every single output power level and without storing unnecessary gain tables.
2Measurement precision
If calibration is performed for all output powers across multiple power modes, then the power amplifier characteristics are accurately calibrated, but storage requirements for gain tables and input power values increase
Solution Approach 1:
The patent extracts and stores only the essential calibration data points (first data point with first input power, second data point with second input power) rather than storing complete gain tables for all output powers. This extraction approach significantly reduces storage requirements while maintaining calibration accuracy through linear interpolation of intermediate values.
Solution Approach 2:
The patent creates interpolated data points as simplified copies between the stored first and second data points. Instead of storing actual measured values for every output power level, the system generates approximate copies through linear interpolation, reducing storage needs while providing sufficiently accurate calibration data for operational purposes.
3Reliability
If separate APT tables are configured for each power mode, then average power tracking is accurately implemented, but device complexity and storage requirements increase
Solution Approach 1:
The patent implements a universal calibration approach using linear interpolation that works across all power modes without requiring separate APT tables for each mode. The same first and second data points can serve multiple power modes through interpolation, reducing configuration complexity and storage requirements while maintaining APT accuracy through the mathematical relationship between input and output power.
Data Source
AI summary
Disclosed is a method of operating an electronic device to transmit an RF signal. The method includes: selecting output power of a PA included in the electronic device, which is required when a signal is transmitted through an antenna included in the electronic device; determining input power of the PA corresponding to the output power of the PA by using at least one of a first data point, a second data point, or a plurality of data points stored in a memory included in the electronic device; and controlling output power of an RF transmission circuit included in the electronic device based on the input power, wherein the plurality of data points are generated by being linearly interpolated between the first data point and the second data point. Various embodiments are possible.