Power Amplifier Calibration Using Single-Point Output Measurement
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Solution Overview
Problem
The existing method of adjusting power amplifiers in wireless communication devices by measuring output power at multiple points is time-consuming and increases manufacturing costs, especially when devices support multiple frequency bands, due to the need for precise input/output characteristic measurements and large storage requirements.
Innovation Solution
A power adjustment method that measures output power at a single point in the linear region, derives a straight line connecting this point and the boundary between linear and nonlinear regions, and uses pre-stored approximate equations to calculate power adjustment coefficients, which are then stored in a semiconductor integrated circuit, reducing the need for extensive measurements and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If output power is measured at multiple measurement points to obtain precise input/output characteristics, then measurement precision is improved, but adjustment time increases and productivity decreases
Solution Approach 1:
The patent applies partial action by measuring output power at only one measurement point in the linear region rather than multiple points. This partial measurement is sufficient when combined with the pre-stored approximate equation for the nonlinear region, achieving acceptable precision while dramatically reducing adjustment time and improving productivity.
Solution Approach 2:
The patent applies preliminary action by pre-storing approximate equations that represent nonlinear region characteristics in the semiconductor integrated circuit before actual power adjustment. This allows the system to quickly calculate input power for nonlinear region output powers without performing time-consuming measurements at multiple points, thus improving measurement speed while maintaining adequate precision.
2Measurement precision
If output power is measured at multiple measurement points to obtain precise input/output characteristics, then measurement precision is improved, but adjustment time increases and time loss increases
Solution Approach 1:
The patent measures output power at only one measurement point rather than multiple points. This partial measurement approach, combined with using pre-stored approximate equations for the nonlinear region, significantly reduces the time required for power adjustment while maintaining sufficient measurement precision for practical purposes.
Solution Approach 2:
The patent pre-calculates and stores approximate equations representing nonlinear region characteristics in the semiconductor integrated circuit before actual use. This preliminary preparation eliminates the need for time-consuming measurements at multiple nonlinear region points, thereby reducing adjustment time loss while preserving measurement accuracy through the use of pre-characterized models.
3Measurement precision
If correspondence relations between input power and output power at multiple measurement points are stored in memory, then measurement precision is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent stores correspondence relations at only one measurement point in the linear region rather than multiple points. By combining this minimal stored data with pre-stored approximate equations for the nonlinear region, the system achieves sufficient precision while dramatically reducing memory storage requirements and device complexity.
Solution Approach 2:
The patent pre-stores approximate equations representing nonlinear region characteristics in the semiconductor integrated circuit before actual power adjustment operations. This preliminary storage of computational models eliminates the need for storing multiple correspondence relation sets in memory, thereby reducing device complexity and manufacturing cost while maintaining measurement precision through mathematical modeling.
Data Source
AI summary
A power adjustment method includes: measuring output power that is obtained when input power to be amplified in a linear region is input to a power amplifier configured to amplify input power linearly in the linear region and amplify input power nonlinearly in a nonlinear region; deriving a straight line connecting a measurement point corresponding to the measured output power and a boundary point between the linear region and the nonlinear region in a coordinate plane representing input/output characteristics; acquiring information on an approximate equation that is stored in advance in correspondence with the measured output power, the approximate equation representing a relation between input power and output power in the nonlinear region; and storing information on the derived straight line and the acquired information on the approximate equation in a semiconductor integrated circuit provided at a preceding stage of the power amplifier.