Modular Wide-Range Transceiver Calibration for Flexible RF Operation
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Solution Overview
Problem
Current microwave RF units are inflexible and costly due to the need for redundant componentry and complex calibration methods, making it difficult to implement multiple modulation schemes, bandwidths, and frequencies, while also occupying significant space and increasing test times.
Innovation Solution
A modular wide-range microwave communication system with pre-calibrated modules, including a calibration memory and radio circuitry, that uses a test signal processing system to determine and store calibration values, allowing for flexible implementation of multiple performance criteria without the need for expensive filter banks or whole-unit calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bank of IF bandpass filters is used to support multiple bandwidths and frequencies, then the transceiver can achieve wide-range operation, but the cost increases significantly and the device occupies significant space
Solution Approach 1:
The transceiver is divided into separate functional modules (RF front end, IF processing, baseband processing) that can be independently configured and calibrated. This segmentation allows each module to be optimized for specific functions without requiring complete redundant componentry across the entire system, reducing overall complexity while maintaining wide-range capability
Solution Approach 2:
The patent implements a universal IF processing path that can handle multiple bandwidths and frequencies through software configuration and digital signal processing, eliminating the need for physical filter banks. The same hardware infrastructure supports various modulation schemes and frequency ranges, achieving wide-range operation without proportional increases in hardware complexity
2Adaptability or versatility
If open-loop calibration methods are used for the transmitter path, then the transceiver can achieve wide dynamic range, but the test setup complexity increases and test times are extended
Solution Approach 1:
The system performs preliminary calibration of individual modules during manufacturing, storing calibration data in lookup tables. This pre-calibration eliminates the need for time-consuming open-loop calibration tests in the field, as the modules are already optimized for wide dynamic range operation. The calibration is done once during production rather than repeatedly during testing
Solution Approach 2:
The patent implements closed-loop calibration using feedback from power meters and control systems. This feedback mechanism allows for automated, rapid calibration that is both faster and more accurate than open-loop methods. The feedback enables real-time adjustments and verification, reducing test time while maintaining the wide dynamic range capability
3Manufacturing precision
If the RF unit is calibrated as a whole unit, then comprehensive calibration is achieved, but the overall test setup complexity and costs increase
Solution Approach 1:
The calibration process is segmented into module-level calibration steps rather than requiring complete whole-unit calibration. Each module (RF front end, IF processing, baseband) is calibrated independently using simplified test setups, then the modules are integrated. This segmentation maintains comprehensive calibration accuracy while dramatically reducing test setup complexity and costs
Data Source
AI summary
The present invention provides a method, system, and processor instructions for calibrating a modular wide-range microwave communication system. In an exemplary embodiment, the system includes a first radio module including a calibration memory and radio circuitry (e.g., RF transmit, RF receive, and IF circuitry), a test signal processing system including a signal generator, measuring unit, memory, and a processor with instructions; and (for over-temperature tests) an oven or other controlled environment. The system is operable for controlling the signal generator to supply a series of test signals to the first radio module, for controlling the radio circuitry to set attenuation values, for controlling the measuring unit to determine characteristics (e.g., output power) of the radio circuitry based on the series of test signals, and for determining calibration values based on the series of test signals, attenuation values, and the determined characteristics of the radio circuitry, whereby the calibration values are stored in the calibration memory of the radio module. A modular wide-range transceiver using pre-calibrated modular units, and its operation, is also disclosed.