Power Amplifier Calibration Using Power Sensor
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Solution Overview
Problem
Conventional calibration systems for radio-frequency circuitry in wireless communications devices are complex, costly, and inefficient, relying on expensive radio communication test equipment that limits production line throughput and scalability.
Innovation Solution
A calibration system using a power sensor and a computer to generate radio-frequency test signals and measure power amplifier gain, producing calibration data to adjust the gain settings of the radio-frequency power amplifier circuitry, thereby ensuring accurate power levels during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radio communication test equipment is used for calibration, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential measurement function from complex radio communication test equipment. Instead of using full-featured spectrum analyzers and bidirectional communication testers, the invention uses a simple power sensor to measure only the forward power signal from the device under test, eliminating unnecessary complexity while maintaining calibration precision.
Solution Approach 2:
The patent replaces expensive, complex radio communication test equipment with inexpensive, simple power sensing components. The power sensor is a low-cost component that can be easily replaced or recalibrated, providing a cost-effective solution that maintains measurement accuracy without the overhead of sophisticated test equipment.
2Measurement precision
If bidirectional communication link establishment is required during calibration, then measurement accuracy is improved, but production throughput decreases
Solution Approach 1:
The patent performs calibration measurements using only the forward power signal before any bidirectional communication is established. The power sensor captures the transmitted signal characteristics directly, allowing calibration to be completed in advance without waiting for complex communication link setup, thereby accelerating production throughput.
Solution Approach 2:
The patent separates the calibration measurement function from the bidirectional communication function. By measuring only the forward power signal independently, the calibration process is segmented from the communication establishment process, allowing them to occur separately and improving overall production efficiency.
3Measurement precision
If expensive spectrum analyzing circuits are used for signal measurement, then measurement precision is improved, but calibration cost increases
Solution Approach 1:
The patent replaces expensive spectrum analyzing circuits with inexpensive power sensor components. The power sensor provides sufficient measurement precision for calibration purposes without the high cost of spectrum analyzers, making the calibration system more economically viable for mass production.
Solution Approach 2:
The patent extracts only the power measurement capability from expensive spectrum analyzing equipment. By using a dedicated power sensor that measures only signal power rather than full spectral analysis, the system achieves necessary measurement precision at a fraction of the cost.
4Reliability
If long cables and shielded boxes are used for calibration, then measurement reliability is improved, but device complexity and setup time increase
Solution Approach 1:
The patent extracts the essential power measurement function from complex shielded box and cable assemblies. By using wireless or direct coupling power sensing methods, the system maintains measurement reliability without requiring cumbersome physical shielding and long cables, simplifying the overall setup.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces costs and complexity by eliminating the need for expensive spectrum analyzer circuitry and long cables, improving production efficiency and scalability by allowing for more efficient calibration of radio-frequency circuitry in wireless communications devices.
Implementation Method 1
a power sensor to measure the power of radio-frequency signals transmitted by the device under test
Data Source
AI summary
A wireless electronic device such as a portable electronic device may contain a baseband module. Power amplifier circuitry in the device may amplify radio-frequency signals for transmission. During calibration measurements, a computer directs the baseband module to generate control signals that adjust the gain of the power amplifier circuitry. The computer may also direct the baseband module to generate a series of modulated or unmodulated test tones at one or more communications channel frequencies. A power sensor may be connected to the output of the power amplifier circuitry using a transmission line path. The computer and power sensor may be used in making power measurements on radio-frequency signals at the output of the power amplifier while power amplifier gain and test tone frequency adjustments are being made. Power amplifier calibration data may be produced and stored in the electronic device based on the power measurements.