RFFE Impedance Calibration Using Reflection Coefficient Segmentation
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Solution Overview
Problem
Existing RFFE calibration methods face challenges in separately calibrating the RFPCB and tuner, requiring large amounts of training data and calibration time, especially when no built-in calibration kit is present, making it difficult to accurately measure impedance.
Innovation Solution
A calibration method for RFFE that involves setting the tuner to predetermined settings, calculating reflection coefficients and impedances at different calibration settings, and using matrix calculations to determine the impedance of the tuner, allowing for efficient calibration without over-the-air transmission or reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate calibration of RFPCB and tuner is performed, then calibration accuracy is improved, but calibration time and effort increase significantly
Solution Approach 1:
The patent divides the calibration process into two distinct segments: RFPCB calibration and tuner calibration. By using separate calibration procedures for each component, the method achieves accurate individual calibration while managing the overall calibration time through efficient sequencing and resource utilization.
Solution Approach 2:
The patent performs preliminary calibration actions by pre-configuring calibration kits at both the RFPCB input and tuner input before the actual calibration process. This preliminary setup enables the calibration system to proceed efficiently without requiring extensive real-time adjustments, thereby reducing overall calibration time while maintaining accuracy.
2Device complexity
If no built-in calibration kit is available at tuner input, then device complexity is reduced, but impedance calibration of feedback path becomes difficult
Solution Approach 1:
The patent introduces an external calibration kit as an intermediary component connected to the tuner input. This calibration kit serves as a mediator that enables accurate impedance calibration of the feedback path without requiring a built-in calibration kit, thereby maintaining device simplicity while achieving calibration accuracy.
Solution Approach 2:
The patent employs a universal calibration approach where the same calibration kit can be used for both RFPCB calibration and tuner calibration. This multi-functional calibration method eliminates the need for separate built-in calibration kits for each component, reducing overall device complexity while maintaining calibration capability.
3Measurement precision
If large amount of training data is used for calibration, then calibration accuracy is improved, but calibration effort and time increase
Solution Approach 1:
The patent performs preliminary calibration actions by pre-configuring calibration kits at both the RFPCB input and tuner input before the actual calibration process. This preliminary setup enables the calibration system to proceed efficiently without requiring extensive real-time adjustments, thereby reducing overall calibration time while maintaining accuracy.
Data Source
AI summary
A calibration method to find the impedance of a radio frequency front-end (RFFE) is provided. The RFFE includes a feedback end and a tuner. The tuner is set to a first predetermined setting to have a first impedance. An output end of the tuner is set to different calibration settings. The first reflection coefficient sets at the feedback end is obtained. The second impedance from the feedback end of the RFFE to an input end of the tuner is calculated based on the first reflection coefficient. The tuner is set to a second predetermined setting. The second reflection coefficient sets at the feedback end is obtained. The third impedance of the tuner in the second predetermined setting is calculated based on the second impedance from the feedback end of the RFFE to the input end of the tuner and the second reflection coefficient sets.